Perhaps you should try some spelling variations:
cheng zhang » cheng han, zhen zhang, chen zheng
zhang xin » zhang jian, zhang ming, zhang fan
jeong shu » jeong su
yan yuan » yan guan, fang yuan, nan yan
yi cheng » yi chen, yu cheng, xi cheng
yan yan » nan yan, yang yang, wang yan
wang » wing, wan, lang

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