Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
china ren » china loren, china real, china reza
yang jun » yang jui, pang jun, yang judy
pang jiu » pang jun, yang jie, pan ji
yang jin » yang jie, ying jin, shang jin
cong seo » hong seo, cong shu, cong sun
yan jiu » yang jie

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 jun) or (yang yang)) china ren ((yan jiu) or (((pang jiu) OR (yang jin)))) cong seo ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((yang jun) OR (yang yang)) china ren ((yan jiu) OR (((pang jiu) OR (yang jin)))) cong seo ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yang jun) or (yang yang)) china ren ((yan jiu) or (((pang jiu) OR (yang jin)))) cong seo ;".
• Adding a wildcard symbol may retrieve word variants: wang ((yang jun) or (yang yang)) china ren ((yan jiu) or (((pang jiu) OR (yang jin)))) cong seo ;*.