Perhaps you should try some spelling variations:
china wang » china chang, china zhang, china won
china yang » china ying, china chang, china zhang
wang liu » wang li, wang lin, wang life
yu cheng » yu chen, _ cheng
liu yan » lili yan
yi chen » jui chen
chun i » chun yi, chun _, chun h

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 liu yan ((yi chen) OR (yu cheng)) ((china wang) OR (china yang)) chun i ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang liu yan ((yi chen) or (yu cheng)) ((china wang) OR (china yang)) chun i ;~".
• Adding a wildcard symbol may retrieve word variants: wang liu yan ((yi chen) or (yu cheng)) ((china wang) OR (china yang)) chun i ;*.