Perhaps you should try some spelling variations:
cost during » boost during, crust during, west during
zhang zhang » zhen zhang, cheng zhang, zhang fang
during risk » using risk, during crises, during crisis
risk coping » risk pooling
wang zhang » wang zheng, wang luhang, wang liang
coping shu » cong shu
ying eu » ying zhu, using eu, ying hua
eu cost » au costa, der cost, end cost

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 zhang) OR (zhang zhang)) ying eu cost during risk coping shu ;~.
• Adding a wildcard symbol may retrieve word variants: ((wang zhang) or (zhang zhang)) ying eu cost during risk coping shu ;*.