Perhaps you should try some spelling variations:
china wong » china hong, china long, china won
china wang » china yang, 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 h » chung h, chun _, chun i

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