Perhaps you should try some spelling variations:
during risk » using risk, during crises, during crisis
risk coping » risk pooling
zhang ting » zhang ming, zhang jing, zhang ying
zhang ping » zhang ming, zhang jing, zhang ying
coping shu » cong shu
end cost » end close, land cost, end iot
eu cost » au costa, der cost, eu court

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