Perhaps you should try some spelling variations:
china gender » china under, child gender, chiefs gender
human china » tuan china, wuhan china, han china
yan human » than human, non human, von human
yang jui » yang judy, yang yi
wong sau » wong sam, wong siu, wong shiu
wan yan » wang yan, nan yan, wai yan
yang xi » yang yi
von sam » von sa, von sap, von scham

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: wan yan human china gender ((((yang jui) OR (yang xi))) OR (yang di)) ((von sam) OR (wong sau)) ;~.
• Adding a wildcard symbol may retrieve word variants: wan yan human china gender ((((yang jui) or (yang xi))) or (yang di)) ((von sam) or (wong sau)) ;*.