Perhaps you should try some spelling variations:
lang yanling » wang yanling, wang yangming, zhang yunling
patient risk » patients risk, patient task, orient risk
patient cost » patient care
yang jui » yang judy, yang di, yang xi
how slum » how slow, how sub, how sun
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: lang yanling ((yang up) or (yang jui)) class ((patient risk) OR (patient cost)) how slum ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: lang yanling ((yang up) OR (yang jui)) class ((patient risk) OR (patient cost)) how slum ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "lang yanling ((yang up) or (yang jui)) class ((patient risk) OR (patient cost)) how slum ;*".