Perhaps you should try some spelling variations:
patient risk » patients risk, patient task, patient cost
among ers » among peers, among users, among east
wang dan » wang yan, wang ban, wang yidan
dan yang » daun yang, tan yang, wang yang
can post » can cost, can lost, can past
can best » can boost
can lose » can close, can lost, can losers

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 dan yang ((can post) OR (((can best) OR (can lose)))) patient risk among ers ;~.
• Adding a wildcard symbol may retrieve word variants: wang dan yang ((can post) or (((can best) or (can lose)))) patient risk among ers ;*.