Perhaps you should try some spelling variations:
green china » greener china, greater china, green machine
long green » going green, long grain
huang yang » huang ying, huang chang, wang yang
china ming » china ying, china jing, china going
yuan long » plan long, un long, van long
wong siu » wong shiu, kong siu, wong sau
yu chen » yu cheng, yi chen, yulu chen

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((huang yang) OR (yu chen)) yuan long green china ming ((song shin) OR (wong siu)) ;~.
• Adding a wildcard symbol may retrieve word variants: ((huang yang) or (yu chen)) yuan long green china ming ((song shin) or (wong siu)) ;*.