Perhaps you should try some spelling variations:
older patients » elderly patients
patients risk » patient risk, patients links, patients si
wang liang » wang yang
among shu » cong shu, among eu, among sex
yang up » yang jui, tying up, yang jun
yang xi » yang di, yang jui
yang yi » yang di, yang jui

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: wang liang ((yang up) OR (((yang xi) OR (yang yi)))) older patients risk among shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang liang ((yang up) or (((yang xi) OR (yang yi)))) older patients risk among shu ;~".
• Adding a wildcard symbol may retrieve word variants: wang liang ((yang up) or (((yang xi) OR (yang yi)))) older patients risk among shu ;*.