Perhaps you should try some spelling variations:
chen zheng » chen zhen, chen aizheng, cheng zhang
zheng min » zhang ming, cheng ming, chang min
jeong shu » jeong su
yuan li » yuan lin, guan li, dayuan li
yuan zi » yan zi, yuan fei, yuan hui
yan zhi » yan zi, wang zhi
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 ((yuan li) OR (((yuan zi) OR (yan zhi)))) chen zheng min ((jeong shu) OR (cong shu)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan ((yuan li) or (((yuan zi) or (yan zhi)))) chen zheng min ((jeong shu) OR (cong shu)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang yan ((yuan li) or (((yuan zi) or (yan zhi)))) chen zheng min ((jeong shu) OR (cong shu)) ;*.