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