Perhaps you should try some spelling variations:
zhang zhang » zhen zhang, cheng zhang, zhang han
during risk » using risk, during crises, during crisis
risk coping » risk pooling
zhang fang » zhang fan, zhang yan, zhang ming
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: ((zhang zhang) OR (zhang fang)) ying ((eu cost) OR (end cost)) during risk coping shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((zhang zhang) or (zhang fang)) ying ((eu cost) OR (end cost)) during risk coping shu ;~".
• Adding a wildcard symbol may retrieve word variants: ((zhang zhang) or (zhang fang)) ying ((eu cost) OR (end cost)) during risk coping shu ;*.