Dead_End writes: According to Basse:Yes, this is possible. I usually use Trigger Studio (although it is possible without it)
Trigger: Civilization Technologies
Starts: ON
Looping: NO
Effect: Research Technology: A. Chu Ko Nu
Trigger: Player is Chinese
Starts: ON
Looping: OFF
Condition: Technology Researched: A. Chu Ko Nu
Effect: Create villager
Effect 2: Create villager
Effect 3: Create villager
Then copy that trigger and change it to the other civs.
(Post edited to suit your question in particular)
Trigger: Civilization Technologies
Starts: ON
Looping: NO
Effect: Research Technology: A. Chu Ko Nu
Trigger: Player is Chinese
Starts: ON
Looping: OFF
Condition: Technology Researched: A. Chu Ko Nu
Effect: Create villager
Effect 2: Create villager
Effect 3: Create villager
Then copy that trigger and change it to the other civs.
(Post edited to suit your question in particular)