Perhaps you should try some spelling variations:
child gender » childs gender, child's gender, china gender
than child » can child, than china
yan than » van thanh, yan zhang, yan clan
yang jui » yang judy, yang xi, yang yi
wong sau » wong sam, wong siu, wong shiu
von sam » von sa, von scham, von sach
von sap » von sa, von sach
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 than child gender ((yang jui) OR (yang di)) ((((von sam) OR (von sap))) OR (wong sau)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yan than child gender ((yang jui) or (yang di)) ((((von sam) or (von sap))) or (wong sau)) ;*.