Perhaps you should try some spelling variations:
china gender » china under, child gender, chiefs gender
chia gene » chia wen
yang jui » yang judy, yang xi, yang yi
wong sau » wong sam, wong siu, wong shiu
yan tan » tan tan, yan clan, yan guan
von sam » von sa, von sap, von scham
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 tan ((chia gene) OR (china gender)) ((yang jui) OR (yang di)) ((von sam) OR (wong sau)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan tan ((chia gene) OR (china gender)) ((yang jui) or (yang di)) ((von sam) or (wong sau)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang yan tan ((chia gene) OR (china gender)) ((yang jui) or (yang di)) ((von sam) or (wong sau)) ;*.