Perhaps you should try some spelling variations:
dong ping » dong sin, dong bin, dong jung
one case » some case, one class, one phase
case dan » case das, case data, case d
yang jie » yang jin, yang jui, yang xi
yang yi » yang xi, yang jui
a chen » ta chen, _ chen, n chen
dan a » dan la, can a, das a

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: one case dan a chen ((((yang jie) OR (dong ping))) OR (yang yi)) ((wang yan) OR (yang di)) ;~.
• Adding a wildcard symbol may retrieve word variants: one case dan a chen ((((yang jie) or (dong ping))) or (yang yi)) ((wang yan) or (yang di)) ;*.