Perhaps you should try some spelling variations:
zhang ming » zhang xin
using risk » during risk, funding risk, rising risks
tong shui » tong hui, cong shu, gong hui
der cost » oder cost, user cost, debt cost
using rs » using r, using _, using a
eu cost » au costa, end cost, eu court
zhen » zheng, when, chen

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: zhen zhang ming ((((eu cost) OR (der cost))) OR (a cost)) ((using risk) OR (using rs)) tong shui ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "zhen zhang ming ((((eu cost) or (der cost))) or (a cost)) ((using risk) OR (using rs)) tong shui ;~".
• Adding a wildcard symbol may retrieve word variants: zhen zhang ming ((((eu cost) or (der cost))) or (a cost)) ((using risk) OR (using rs)) tong shui ;*.