Perhaps you should try some spelling variations:
tuan china » wuhan china, can china, taiwan china
china gene » china gender, china agenda
yan tuan » yan guan, yan yuan, anh tuan
yang jui » yang judy, yang xi, yang yi
wong sam » wong sau, wong lai, kong sar
won sau » wong sau, wong siu
wang » wing, wan, lang

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: wang yan tuan china gene ((yang jui) OR (yang di)) ((won sau) OR (wong sam)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yan tuan china gene ((yang jui) or (yang di)) ((won sau) or (wong sam)) ;*.