Perhaps you should try some spelling variations:
cheng zhang » cheng han, zhen zhang, china zhang
chen zheng » chen zhen, chen aizheng, chen zhe
wang nan » wang yan, wang ban, wang dan
jeong su » jeong _, jeong 情, rong su
jeong mi » jeong _, jeong 情, jong min
nan yan » nan ya, wang yan, qian yan
yan li » yang li, yuan li, gan li

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 nan yan li ((chen zheng) OR (cheng zhang)) min ((jeong su) OR (jeong mi)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang nan yan li ((chen zheng) or (cheng zhang)) min ((jeong su) OR (jeong mi)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang nan yan li ((chen zheng) or (cheng zhang)) min ((jeong su) OR (jeong mi)) ;*.