Perhaps you should try some spelling variations:
tuan china » wuhan china, can china, taiwan china
china chen » china shen, china china, china chang
long dinh » long trinh, long did
dinh tuan » binh thuan, dinh tung, anh tuan
yang jui » yang judy, yang yi
yang jie » yang jin, yang yi, yang jun
yang xi » yang yi

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: long dinh tuan china chen ((((yang jui) OR (yang di))) OR (((yang jie) OR (yang xi)))) cong shu ;~.
• Adding a wildcard symbol may retrieve word variants: long dinh tuan china chen ((((yang jui) or (yang di))) or (((yang jie) or (yang xi)))) cong shu ;*.