Perhaps you should try some spelling variations:
chen cheng » chen chung, chen zheng, chen zhen
cheng han » chen hao
yang jie » yang jin, yang jui, yang xi
yang yi » yang xi, yang jui
ng yew » ong yew
a chen » ta chen, _ chen, n chen
yew a » yet a, new a, ye a
sci a » sci 3, scl a, scm a
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) OR (yang jie))) OR (((yang di) OR (yang yi))))ng yew a chen cheng han sci a ;~.
• Adding a wildcard symbol may retrieve word variants: ((((wang yan) or (yang jie))) or (((yang di) or (yang yi))))ng yew a chen cheng han sci a ;*.