Perhaps you should try some spelling variations:
during crisis » during crises, housing crisis
wang zhang » wang zheng, wang luhang, zhang zhang
zhang ping » zhang ming, zhang jing, zhang ting
jie debate » die debatte, wide debate, aid debate
how space » how race
ping jie » ping jia, jing ji, yang jie
how safe » how safety, how scale, how state

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 zhang ping jie debate during crisis ((how safe) OR (how space)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang zhang ping jie debate during crisis ((how safe) or (how space)) ;*.