Perhaps you should try some spelling variations:
cost during » boost during, crust during, west during
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.

• Adding a wildcard symbol may retrieve word variants: chen zhang ying der cost during risk how shu ;*.