Perhaps you should try some spelling variations:
sharing risk » sharing best, during risk
chen zhang » cheng zhang, zhen zhang, chen zheng
zhang ying » zhang ming, zhang jing, zhang ping
end cost » end close, land cost, end iot
der cost » oder cost, user cost, debt cost
eu cost » au costa, eu court, run 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: chen zhang ying ((((eu cost) OR (end cost))) OR (der cost)) sharing risk how shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "chen zhang ying ((((eu cost) OR (end cost))) or (der cost)) sharing risk how shu ;~".
• Adding a wildcard symbol may retrieve word variants: chen zhang ying ((((eu cost) OR (end cost))) or (der cost)) sharing risk how shu ;*.