Perhaps you should try some spelling variations:
yuan cheng » yuan chang, huang cheng, yu cheng
wang yuan » wang yuhan, wang yan, fang yuan
tan ying » fan ying, tan yang, tan yong
ran ying » fan ying, jin ying, gao ying
yang jie » yang jin, yang di, yang jui
yang xi » yang di, yang yi, yang jui
hai » hadi, haji, hari

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: ((tan ying) OR (ran ying)) wang yuan cheng ((yang jie) OR (yang xi)) dang hai ;~.
• Adding a wildcard symbol may retrieve word variants: ((tan ying) or (ran ying)) wang yuan cheng ((yang jie) or (yang xi)) dang hai ;*.