Perhaps you should try some spelling variations:
patients risk » patient risk, patients links, patients si
yang yanling » wang yanling, wang yangming, zhang yunling
wang yang » wang yan, wang liang, wang yanling
can close » can lose, a close, can cause
among who » along who, among hr
wrong who » wrong why, wrong what, wrong when
can lost » can cost, can lose, 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 yang yanling ((can close) OR (can lost)) patients risk ((among who) OR (wrong who)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yang yanling ((can close) or (can lost)) patients risk ((among who) or (wrong who)) ;*.