Perhaps you should try some spelling variations:
sharing risk » sharing best
during risk » using risk, during crises, during crisis
wang zhang » wang zheng, wang luhang, zhang zhang
zhang jing » zhang ming, zhang jin, zhang ping
hua cost » a cost, eu cost, run cost
der cost » oder cost, user cost, debt cost
how shu » how she, how shih, how slum

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 jing ((hua cost) OR (der cost)) ((sharing risk) OR (during risk)) how shu ;~.
• Adding a wildcard symbol may retrieve word variants: wang zhang jing ((hua cost) or (der cost)) ((sharing risk) or (during risk)) how shu ;*.