Perhaps you should try some spelling variations:
during risk » using risk, during crises, during crisis
risk coping » risk pooling
wang zhang » wang luhang, zhang zhang, wang liang
wang zheng » tang zheng, wang zhenpo, fang sheng
coping shu » cong shu
au costa » can costa, _ costa, da costa
der cost » oder cost, user cost, debt 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 (wang zheng)) ming ((au costa) OR (der cost)) during risk coping shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang zhang) OR (wang zheng)) ming ((au costa) or (der cost)) during risk coping shu ;~".
• Adding a wildcard symbol may retrieve word variants: ((wang zhang) OR (wang zheng)) ming ((au costa) or (der cost)) during risk coping shu ;*.