Perhaps you should try some spelling variations:
closed during » closed string, used during, losers during
during risk » using risk, during crises, during crisis
risk coping » risk pooling
und closed » end close, und cloud, und clover
coping shu » cong shu
wang yang » wang yan, wang yanling
yang und » gang und, lang und, rang und

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 yang) OR (wang liang)) yang und closed during risk coping shu ;~.
• Adding a wildcard symbol may retrieve word variants: ((wang yang) or (wang liang)) yang und closed during risk coping shu ;*.