Perhaps you should try some spelling variations:
yang guang » yang yang, yan guan, yang liang
case dann » case anna, case anne, case das
one case » some case, one class, one phase
dann bin » dong bin
yang jin » yang jie, yang jun, ying jin
tang yun » yang yun, chang yun, fang yuan
yang yi » yang xi, yang jui

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 dann bin we ((((yang yi) OR (yang guang))) OR (yang jin)) ((tang yun) OR (yang di)) ;~.
• Adding a wildcard symbol may retrieve word variants: one case dann bin we ((((yang yi) or (yang guang))) or (yang jin)) ((tang yun) or (yang di)) ;*.