10391
Cochinchina , Annam and Tonkin ( encompassing modern-day Vietnam ) became a source of tea , rice , coffee , pepper , coal , zinc and tin , while Cambodia became a centre for rice and pepper crops .
 Cochinchina, Annam, Tonkin, Vietnam, Cambodia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Cochinchina, Annam, Tonkin, Vietnam, Cambodia