Perhaps you should try some spelling variations:
than china » tuan china, han china, wuhan china
china gene » china gender, china agenda
yan than » van thanh, yan zhang, yan clan
yang jui » yang xi, yang yi
von sles » von see, von seo, von seu
wong sau » wong sam, wong siu, wong shiu
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 china gene ((((yang jui) OR (yang judy))) OR (yang di)) ((von sles) OR (wong sau)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yan than china gene ((((yang jui) or (yang judy))) or (yang di)) ((von sles) or (wong sau)) ;*.