Perhaps you should try some spelling variations:
yanling yang » yang yang, ying yang
ratings risk » patients risk
patient risk » patients risk, patient cost, orient risk
patient task » patient cases, patient stays, patient care
yan yanling » wang yanling, yan jianping
yang lost » can lost
among who » along who, among hr, wrong who
wang » wing, wan, lang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang yan yanling yang lost ((ratings risk) or (((patient risk) OR (patient task)))) among who ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan yanling yang lost ((ratings risk) OR (((patient risk) OR (patient task)))) among who ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan yanling yang lost ((ratings risk) or (((patient risk) OR (patient task)))) among who ;*".