Perhaps you should try some spelling variations:
yuan cheng » yuan chang, huang cheng, yu cheng
chen ying » chen yang, chen ping, chen jing
yan yuan » yan guan, fang yuan, nan yan
cheng lu » cheng chu, chen yu, cheng _
ying jin » yang jin, jing ji, yang jie
lu chen » li chen, yu chen, yulu chen
sar » sara, star, saur

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: yan yuan cheng lu chen ying jin ((cong shu) or (kong sar)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: yan yuan cheng lu chen ying jin ((cong shu) OR (kong sar)) ;*.