Perhaps you should try some spelling variations:
wang yidan » wang yan
yidan wang » yiqian wang, qian wang, yan wang
yuan cheng » yuan chang, huang cheng, yu cheng
hua cheng » hua chen, huang cheng, yu cheng
zhang yan » zhang fan, zhang jian, wang yan
zhang zhi » zhong zhi, wang zhi, zhang wei
hong zhi » zhong zhi, hong ghi, wang zhi

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 yidan wang ((hua cheng) OR (yuan cheng)) zhang yan ((hong zhi) OR (zhang zhi)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yidan wang ((hua cheng) or (yuan cheng)) zhang yan ((hong zhi) OR (zhang zhi)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang yidan wang ((hua cheng) or (yuan cheng)) zhang yan ((hong zhi) OR (zhang zhi)) ;*.