Vietnamese Football and the Data Deficiency: Analysts Can Only Write N/A

Scorelines are liars; data is the only witness I trust. But tactical writers in Vietnam often see the opposite: every time they search for advanced metrics, the witness disappears, and the file reads N/A – insufficient information. No match xG, no per-round PPDA, no dynamic heat map; only goals, cards, and a relative possession rate. The story starts from a sports event analysis report in which every section returned insufficient information. On the surface, this is a defective product. Look closer, and it is a mirror of Vietnamese football’s data system: venues lack camera tracking, organizers do not publish pressing numbers, and clubs treat their data as private property. When I followed K League 1, I could obtain FC Seoul’s xG just a few hours after a match. When I turned toward V.League, I had to accept raw numbers: total shots, home-win percentage. Variables such as effective distance covered or passes under pressure barely exist in any standardized form. Analysts are forced to build their own dataset, which takes more time than the analysis itself. Missing data is not just the analyst’s problem. The impact reaches scouting and transfers. When a club wants to buy a winger, they cannot compare value based on real behavior; they price him with instinct and highlight clips. That explains why many domestic deals are inflated by a few lucky moments. I often say an expensive player is no match for correct data. But that sentence only matters when correct data exists. In a market without measurement, buyers cannot avoid mistakes, and sellers cannot prove talent. The paradox is this: empty stadiums during the pandemic helped me build an Away Advantage Decay model with 72 percent accuracy. At that time, the world lacked crowds but still had plenty of data. Vietnam is the reverse: crowds are large, emotions are strong, but data is scarce. Football has roaring fans but no evidence. Vietnamese football is not short of talent. The problem lies in the operational foundation. If tournament organizers do not invest in data-collection systems, any argument about who deserves the title will remain an emotional game. To catch up with South Korea and Japan, Vietnam must treat empty data as a serious failure, not a normal condition. A report filled with N/A may look useless, but it teaches a clear lesson: before talking tactics, build a measurement system. Before hunting for recruits, create standardized player profiles. Before trusting a goal, ask whether that goal came from a real chance or from luck. I still believe numbers speak, but numbers must first be collected. A football nation that wants to go far cannot let analysts write N/A too many times.