Perhaps you should try some spelling variations:
how could » how should
yang yang » wang yang, wang yan
meng yuan » meng hsuan, fang yuan, feng juan
one case » some case, one class, one phase
case day » case das, case data, case d
ying jin » yang jin, jing ji, yang jie
day how » days how, way how, say how
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 day how could ((((ying jin) OR (yang yang))) OR (yang di)) ((meng yuan) OR (yang yi)) ;~.
• Adding a wildcard symbol may retrieve word variants: one case day how could ((((ying jin) or (yang yang))) or (yang di)) ((meng yuan) or (yang yi)) ;*.