Perhaps you should try some spelling variations:
china gene » china gender, china agenda
yan tuan » yan yuan, anh tuan, can turn
yan guan » gan guan, yan yuan, yang guang
wong sam » wong sau, wong lai, kong sar
wong siu » wong shiu, kong siu, wong sau
yang yi » yang xi, yang jui
wang » wing, wan, lang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang ((yan tuan) OR (yan guan)) china gene ((yang yi) or (yang di)) ((wong sam) or (wong siu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((yan tuan) OR (yan guan)) china gene ((yang yi) OR (yang di)) ((wong sam) OR (wong siu)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yan tuan) OR (yan guan)) china gene ((yang yi) or (yang di)) ((wong sam) or (wong siu)) ;*".