When Vietnamese Martial Arts Lack Data, Every Conclusion Becomes Emotion

Saturday night, in a gym in Hai Phong, I open a spreadsheet before watching a fight. Four columns: significant strikes landed per minute, takedown defence rate, the gap between competition weight and walking-around weight, and the number of days of rest since the most recent knockout absorbed. All four columns are empty.

On screen, a highlight clip has passed several hundred thousand views in two days. The comment section argues over whether that kick deserves the label "holy strike". Nobody asks what the fighter weighed on the scale, how much water he lost in the 24 hours before, or how many strikes to the head he absorbed across his last four bouts.

I write two words in my notebook: not available. After nine years of reading and writing about sport, that is the phrase I write most whenever I touch Vietnamese martial arts — a fighting culture with tens of thousands of people training every evening, hundreds of events a year, and almost no recording system rigorous enough to analyse.

"An empty stadium does not become poorer; it strips away the noise so the data can speak." In Vietnamese martial arts, the stadium is not empty. The stands are full, the livestream is full, the vertical clips are full. Only the data is empty.

In May 2026, the 31st SEA Games were held in Hanoi, and the Vietnamese delegation topped the medal table with 205 gold medals. The combat sports group — wushu, boxing, muay, pencak silat, judo, vovinam — contributed a large share of that total. The press covered it heavily. But if you ask what strike structure won that gold medal, in which round, and on what foul the opponent lost a point, the answer usually collapses into a single word: spirit.

After the SEA Games, the commercial martial arts movement exploded. MMA, Muay Thai, boxing and kickboxing gyms opened in Hanoi, Hai Phong, Da Nang and Ho Chi Minh City. Domestic professional fight nights became more regular, with sponsors, with small-scale pay television, with ticketed audiences. A new generation of fighters has grown up in an environment where being seen matters almost as much as being assessed correctly.

The paradox sits here: the volume of footage has grown faster than the volume of information. A fight gets filmed from four angles, replayed three times, cut into twenty clips — and still there is no statistical sheet telling you who won at which range. Viewers learn to recognise a beautiful kick; they do not learn to read who controls space.

I take my yardstick from my own work. In 2026, when football returned in empty stadiums, I tracked 26 matchdays and found the home win rate fell from 43% to 33%, while ball recoveries in the opposition's final third dropped 12%. Those numbers never appeared on the scoreboard. They appeared because somebody sat down and counted. Vietnamese martial arts has nobody sitting down and counting.

Compare that with domestic football: however data-poor it remains, a V.League match still leaves behind a starting line-up, goal minutes, cards and substitution counts. What does a fight leave behind? A result, and sometimes the name of the finishing technique. Everything else — rhythm, range, strikes landed, weight-cut margin — vanishes from the record. A sport that cannot store its past must relitigate it from scratch every time.

Before talking about missing data, we have to talk about a bigger error: collapsing three different frames of reference into one word.

In Vietnamese, "vo" is a common noun. In analysis, it is three problems that cannot share a formula.

The first problem is professional combat — MMA, boxing, kickboxing, Muay Thai. Here there are wins and losses, rounds, the 10-point must system, finishes. The analytical tools are significant strike rate, takedown defence, and the ratio of decision wins to finishes.

The second problem is taolu — forms. There is no opponent. There is no win or loss inside a sequence. Points split between Panel A (movement difficulty) and Panel B (execution quality). An athlete like Duong Thuy Vi is measured by the difficulty and cleanliness of her routine, not by a win count. Applying finish-rate logic to a jianshu routine is meaningless; applying difficulty-score logic to an MMA bout is equally meaningless.

The third problem is sanda — combat with punches, kicks and throws. Its rules diverge sharply from professional kickboxing in throwing and throw scoring, in ring format, and in how simultaneous falls are handled.

Three frames of reference, three datasets, three ways of telling the story. Vietnamese media uses one word and one narrative frame: spirit.

And this is a technical consequence, not a moral one: when you cannot measure anything, you attribute it to spirit; spirit becomes the name that missing data gives itself. A fighter who loses because he was pinned in the corner for two rounds gets called "lacking character". A fighter who wins because his opponent missed weight gets called "iron will". Both sentences are emotionally accurate and tactically useless.

"I stayed up all night in 2026; by morning, football appeared to me in flesh and bone." The lesson from that night — France with 39% possession but 11 shots on target against Argentina — was a lesson about space, and it transfers straight into combat sports. In a fight, the space is not between two lines of a formation; it is between two ranges.

Every fighter owns a preferred range. Some live on the outside, where the jab and the lead kick decide. Some live at mid-range, where body kicks and high kicks open up. Some live in close, where clinch, elbows, throws and the transition to the ground are the currency. Whoever takes his range first usually wins; whoever is dragged out of his range usually loses his structure.

For a fighter like Nguyen Tran Duy Nhat, the technical story revolves around holding kicking range and distributing output across three rounds. Without data on how often he enters kicking range, how often he is pushed to the corner, and how long he holds the centre, a writer can only retell the feeling. And feeling is the easiest thing to counterfeit with a handsome clip.

This is where I apply the principle of space, as a fight reading a fight: whoever takes the gap first, pins the opponent into a dead corner and keeps the centre of gravity, that man owns the contest. Three minimum indicators are enough to verify it: entries into the preferred range, times pushed to the corner or ropes, and time controlling the centre. No gym in Vietnam publishes those three indicators after a bout. No promotion stores them.

"A match is a book; ordinary readers read the ending, I read the footnotes." The footnotes of a fight are exactly those three lines. Without footnotes, the book is only a cover.

And every game plan dissolves in the second round. "Every diagram is obsolete by minute 70; the good ones redraw it inside their heads." In fighting, minute 70 is round two, when the opponent has finished reading your rhythm and starts breaking it. The winner is not the man with the better plan; the winner is the man who repairs the plan faster.

Most arguments about Vietnamese martial arts ignore the biggest and most easily measured variable: the weight cut.

The number on the scale is not body weight. It is body weight after a process of dehydration, controlled or otherwise. The gap between walking-around weight and competition weight — in some cases 5 to 8 kilograms inside a few days — decides speed, third-round durability and punch resistance. A fighter who enters dehydrated loses reflexes before he loses strength.

In tightly organised fight cultures, that gap is recorded and rehydration is monitored through a second weigh-in before competition. In Vietnam, official weights usually appear as one short line of news, if at all. There is no longitudinal weight database, no missed-weight history, no list of fighters placed under post-fight medical suspension.

The consequence is a media paradox: fans can rewatch the decisive kick from four angles, but cannot know how much weight that fighter had to cut to be there. The biggest pre-fight risk is an invisible one.

The principle I have held since 2026: an unpublished indicator does not mean it does not exist. It only means nobody has bothered to count. And in combat sports, what nobody counts is usually what decides.

Moving to the medical side, the gap is wider still.

Brain-health risk in combat sports is estimated from three variables: cumulative strikes to the head, number of knockouts absorbed, and the interval before returning after each knockout. All three can be logged in a simple spreadsheet. No domestic professional promotion publishes all three.

This produces a very common reading error, and I want to state it plainly: a risk profile that has never been compiled is not a clean risk profile. When there is no medical suspension list, the correct conclusion is "nobody has checked