Perhaps you should try some spelling variations:
boost during » roosts during, books during, boom during
cost during » crust during, west during, roosts during
risk coping » risk pooling
wang wang » wang yang, wang liang, wang yan
wang ying » wang yang, wang yong, wang jing
risk cong » risk among, risk along, risk cost
ying jin » yang jin, jing ji, yang jie

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 ying jin ((cost during) OR (boost during)) ((risk cong) OR (risk coping)) shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang wang ying jin ((cost during) or (boost during)) ((risk cong) OR (risk coping)) shu ;~".
• Adding a wildcard symbol may retrieve word variants: wang wang ying jin ((cost during) or (boost during)) ((risk cong) OR (risk coping)) shu ;*.