Perhaps you should try some spelling variations:
liang yanling » wang yanling, jiang yajing, liang ying
patients risk » patient risk, patients links, patients si
wang liang » wang yang
wrong who » wrong why, wrong what, wrong when
can lose » can close, can lost, can losers
can cost » can costa, can lost, can post
among hr » among hard, among ers, among hiv

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 liang yanling ((can lose) OR (can cost)) patients risk ((among hr) OR (wrong who)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang liang yanling ((can lose) or (can cost)) patients risk ((among hr) or (wrong who)) ;*.