Perhaps you should try some spelling variations:
class patient » cross patient, access patient, class latin
patient risk » patients risk, patient task, patient cost
risk tong » risk among, risk along
tong shui » tong hui, cong shu, gong hui
yang jui » yang judy, yang xi
yang yi » yang xi
wang » wing, wan, lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yanling ((yang di) or (((yang jui) OR (yang yi)))) class patient risk tong shui ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yanling ((yang di) OR (((yang jui) OR (yang yi)))) class patient risk tong shui ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yanling ((yang di) or (((yang jui) OR (yang yi)))) class patient risk tong shui ;*".