Perhaps you should try some spelling variations:
yuan cheng » yuan chang, huang cheng, yu cheng
zhang xiao » zhang xiabo, zhong xiao, zhang xiaobo
xiao zhang » xiabo zhang, hao zhang, jia zhang
yang yang » wang yang, wang yan
hua cheng » hua chen, huang cheng, yu cheng
zhang zhi » zhong zhi, wang zhi, zhang wei
qian yan » qian jun, qian yi

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang ((yang yang) or (qian yan)) ((hua cheng) or (yuan cheng)) zhang xiao zhang zhi ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((yang yang) OR (qian yan)) ((hua cheng) OR (yuan cheng)) zhang xiao zhang zhi ;.
• Adding a wildcard symbol may retrieve word variants: wang ((yang yang) or (qian yan)) ((hua cheng) or (yuan cheng)) zhang xiao zhang zhi ;*.