Perhaps you should try some spelling variations:
wang zhang » wang zheng, wang luhang, zhang zhang
zhang ying » zhang ming, zhang jing, zhang ping
jin debate » gain debate, aid debate, un debate
do safety » dam safety, bio safety, two safety
ying jin » yang jin, jing ji, yang jie
how safe » how safety, how space, how scale

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 ying jin debate during crises ((how safe) OR (do safety)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang zhang ying jin debate during crises ((how safe) or (do safety)) ;*.