Perhaps you should try some spelling variations:
patient task » patient cases, patient stays, patient care
patient risk » patients risk, patient cost, orient risk
wan yanling » wang yanling, wang yangming, wang danning
among sri » among sex, among di, among ers
tying up » taking up, tying _
yang jui » yang judy, yang di, yang xi

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

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