Perhaps you should try some spelling variations:
during risk » using risk, during crises, during crisis
von cash » von carl, can cash, do cash
da costa » _ costa, a cost
yang jui » yang judy, yang di, yang xi
yan jiu » yang jie, yang jin, pang jiu
yang du » yang di, yang d, yang mu
wang » wing, lang

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: (wang OR wan) yan jiu ((da costa) OR (von cash)) during risk ((yang du) OR (yang jui)) ;~.
• Adding a wildcard symbol may retrieve word variants: (wang or wan) yan jiu ((da costa) or (von cash)) during risk ((yang du) or (yang jui)) ;*.