Perhaps you should try some spelling variations:
zhang zhang » zhen zhang, cheng zhang, zhang fang
cost during » boost during, crust during, west during
during risk » using risk, during crises, during crisis
risk coping » risk pooling
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: ((zhang zhang) OR (zhang fan)) ying eu cost during risk coping shu ;~.
• Adding a wildcard symbol may retrieve word variants: ((zhang zhang) or (zhang fan)) ying eu cost during risk coping shu ;*.