Perhaps you should try some spelling variations:
china gender » china under, child gender, chiefs gender
than china » tuan china, han china, wuhan china
yan than » van thanh, yan zhang, yan clan
yang jui » yang judy, yang xi, yang yi
wong sam » wong lai, kong sar, von sam
wong sau » wong siu, wong shiu, wong lai
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 than china gender ((yang jui) OR (yang di)) ((wong sam) OR (wong sau)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yan than china gender ((yang jui) or (yang di)) ((wong sam) or (wong sau)) ;*.