Perhaps you should try some spelling variations:
past cases » past case, test cases, east case
cases when » cases where, cases what, games when
yang yang » wang yang, wang yan
shang hai » shang kai, dang hai, chang ha
yang jin » yang jie, yang jun, ying jin
we shen » wei shen, we spend
yang xi » yang yi, 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 cases when we shen ((((((yang yang) OR (yang jin))) OR (yang xi))) OR (yang di)) shang hai ;~.
• Adding a wildcard symbol may retrieve word variants: past cases when we shen ((((((yang yang) or (yang jin))) or (yang xi))) or (yang di)) shang hai ;*.