Perhaps you should try some spelling variations:
zhang zhang » zhen zhang, cheng zhang, zhang fang
wang lihong » wang liang, wang shiyong
cost during » boost during, crust during, west during
during risk » using risk, during crises, during crisis
risk cong » risk coping, risk among, risk along
ping eu » ping ku, ping yu, ping ceo
eu cost » au costa, der cost, end cost

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: ((zhang zhang) OR (wang lihong)) ping eu cost during risk cong shu ;~.
• Adding a wildcard symbol may retrieve word variants: ((zhang zhang) or (wang lihong)) ping eu cost during risk cong shu ;*.