Perhaps you should try some spelling variations:
cheng zhang » cheng han, zhen zhang, china zhang
chen zheng » chen zhen, chen aizheng, chen zhe
ming jeong » min jeong, ming kong
jeong shu » jeong su, cong shu
wan yan » wang yan, nan yan, wai yan
yuan li » yuan lin, guan li, dayuan li
yuan zi » yan zi, yuan fei, yuan hui

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: wan yan ((yuan li) OR (yuan zi)) ((cheng zhang) OR (chen zheng)) ming jeong shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wan yan ((yuan li) or (yuan zi)) ((cheng zhang) OR (chen zheng)) ming jeong shu ;~".
• Adding a wildcard symbol may retrieve word variants: wan yan ((yuan li) or (yuan zi)) ((cheng zhang) OR (chen zheng)) ming jeong shu ;*.