Perhaps you should try some spelling variations:
china loren » china lehren, china korea, china more
yang jin » ying jin, shang jin, wang jing
yang jun » yang jui, pang jun, yang judy
yang jie » yang di, yang jui, yang xi
yan can » yan clan, man can, yan cong
yan jiu » pang jiu
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 loren ((yan jiu) OR (((((yang jin) OR (yang jun))) OR (yang jie)))) cong shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan can china loren ((yan jiu) or (((((yang jin) OR (yang jun))) or (yang jie)))) cong shu ;~".
• Adding a wildcard symbol may retrieve word variants: wang yan can china loren ((yan jiu) or (((((yang jin) OR (yang jun))) or (yang jie)))) cong shu ;*.