Perhaps you should try some spelling variations:
patients risk » patient risk, patients links, patients si
jiang yajing » jiang liping, liang ying
wang jiang » wang liang, wang jing, wang yang
can close » can lose, a close, can cause
among who » along who, among hr, wrong who
can cost » can costa, can lost, can post

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 jiang yajing ((can close) OR (can cost)) patients risk among who ;~.
• Adding a wildcard symbol may retrieve word variants: wang jiang yajing ((can close) or (can cost)) patients risk among who ;*.