Perhaps you should try some spelling variations:
cost during » boost during, crust during, west during
risk coping » risk pooling
wang wang » wang liang, wang yan, wang yong
wang yang » wang yan, wang liang, wang yanling
yang mind » yang cindy, yang jin, sang minh
mind cost » wind costs, end cost, land 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: wang wang yang mind cost during ((risk coping) OR (risk among)) shu ;~.
• Adding a wildcard symbol may retrieve word variants: wang wang yang mind cost during ((risk coping) or (risk among)) shu ;*.