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

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))) OR (yang jui)) costs patients risk how slow ;~.
• Adding a wildcard symbol may retrieve word variants: wan yanling ((((yang up) or (yang jun))) or (yang jui)) costs patients risk how slow ;*.