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 sau, kong sar, von sam
wang » wan, lang
lai » laid

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 OR wing) yan than china gender ((yang jui) OR (yang di)) ((wong sam) OR (wong lai)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(wang OR wing) yan than china gender ((yang jui) or (yang di)) ((wong sam) or (wong lai)) ;~".
• Adding a wildcard symbol may retrieve word variants: (wang OR wing) yan than china gender ((yang jui) or (yang di)) ((wong sam) or (wong lai)) ;*.