Perhaps you should try some spelling variations:
sharing risk » sharing best
during risk » using risk, during crises, during crisis
chen zhang » cheng zhang, zhen zhang, chen zheng
zhang ying » zhang ming, zhang jing, zhang ping
ying der » ding der
der cost » oder cost, user cost, debt cost
how shu » how shih, how slum
how she » how some, how safe, how shih

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: chen zhang ying der cost ((sharing risk) or (during risk)) ((how shu) OR (how she)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: chen zhang ying der cost ((sharing risk) OR (during risk)) ((how shu) OR (how she)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "chen zhang ying der cost ((sharing risk) or (during risk)) ((how shu) OR (how she)) ;*".