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 she, how shih, how slum

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 ;~.
• 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 ;*".