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

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "wang zhang ying jie debate during crisis ((how safe) OR (how safety)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang zhang ying jie debate during crisis ((how safe) OR (how safety)) ;*.