Perhaps you should try some spelling variations:
china gene » china gender, china agenda
yang jui » yang judy, yang xi, yang yi
wong sau » wong siu, wong shiu, wong lai
wong sam » wong lai, kong sar, von sam
yan can » yan clan, yan cong, yan guan
man can » man han, woman can, man kann
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 can) OR (man can)) china gene ((yang jui) OR (yang di)) ((wong sau) OR (wong sam)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yan can) OR (man can)) china gene ((yang jui) or (yang di)) ((wong sau) or (wong sam)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang ((yan can) OR (man can)) china gene ((yang jui) or (yang di)) ((wong sau) or (wong sam)) ;*.