Perhaps you should try some spelling variations:
past mass » past pasts, past case, past has
mass when » ass when, cases when, bars when
yang yang » wang yang, wang yan
shang kai » shang hai
when wei » when we, zhen wei, chen wei
wei shen » kwei sheng, enwei shen, wei shang
ying jin » yang jin, jing ji, yang jie
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: past mass when wei shen ((((((yang yang) OR (ying jin))) OR (yang di))) OR (yang yi)) shang kai ;~.
• Adding a wildcard symbol may retrieve word variants: past mass when wei shen ((((((yang yang) or (ying jin))) or (yang di))) or (yang yi)) shang kai ;*.