Perhaps you should try some spelling variations:
cost patient » cross patient, courts patient, class patient
patient risk » patients risk, patient task, patient cost
wan yanling » wang yanling, wang yangming, wang danning
among sri » among di, among ers, among hr
among sex » among smes, among eu
yang jun » yang jui, pang jun, yang jin
yang up » yang jui, tying up, hang ups

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: wan yanling ((yang up) OR (yang jun)) cost patient risk ((among sri) OR (among sex)) ;~.
• Adding a wildcard symbol may retrieve word variants: wan yanling ((yang up) or (yang jun)) cost patient risk ((among sri) or (among sex)) ;*.