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 lose » can close, can lost, can losers
can post » can cost, can lost, can past
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 yang yanling ((can lose) OR (can post)) patients risk among hr ;~.
• Adding a wildcard symbol may retrieve word variants: wang yang yanling ((can lose) or (can post)) patients risk among hr ;*.