Perhaps you should try some spelling variations:
during risk » using risk, during crises, during crisis
pei yang » wei yang, hui yang, pei yun
von carl » von karl
yang xi » yang di, yang jui
yang du » yang di, yang d, yang mu
yang yi » yang di, yang jui
cost » costs
cash » case

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: pei yang xi ((a cost) OR (((do cash) OR (von carl)))) during risk ((yang du) OR (yang yi)) ;~.
• Adding a wildcard symbol may retrieve word variants: pei yang xi ((a cost) or (((do cash) or (von carl)))) during risk ((yang du) or (yang yi)) ;*.