Reference
Exactly what Vietnamese can train, build and research, by age.
Archer civilization
•Enemy Town Centers are revealed at the start of the game
•Economic upgrades cost no wood and research +100% faster
•Archery Range units and Fire Lancers +20% HP
•Conscription free
Team bonusImperial Skirmisher upgrade available in Imperial Age
54 units · 29 buildings · 73 technologies. Each building carries what it trains and researches; upgrades sit under what they upgrade from.