Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
china ren » china loren, china real, china reza
gan guan » yan guan, quan guan, fan guon
yang jin » yang jun, ying jin, shang jin
yang jie » yang di, yang jui, yang xi
cong sun » cong shu, cong van, wing sun
yan jiu » pang jiu

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang ((yang yang) or (gan guan)) china ren ((((yan jiu) or (yang jin))) or (yang jie)) cong sun ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((yang yang) OR (gan guan)) china ren ((((yan jiu) OR (yang jin))) OR (yang jie)) cong sun ;.
• Adding a wildcard symbol may retrieve word variants: wang ((yang yang) or (gan guan)) china ren ((((yan jiu) or (yang jin))) or (yang jie)) cong sun ;*.