Perhaps you should try some spelling variations:
patients risk » patient risk, patients links, patients si
cost patients » cost patient, cleft patients, care patients
wan yanling » wang yanling, wang yangming, wang danning
yang jui » yang judy, yang di, yang xi
how slow » how low, how slower, grow slow
yang up » tying up, yang jun, hang ups

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 ((yang up) or (yang jui)) cost patients risk how slow ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wan yanling ((yang up) OR (yang jui)) cost patients risk how slow ;*.