Perhaps you should try some spelling variations:
older patient » older patients, der patient, her patient
patient risk » patients risk, patient task, patient cost
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 yi, 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)) older patient risk among shu ;~.
• Adding a wildcard symbol may retrieve word variants: wang liang ((yang up) or (yang xi)) older patient risk among shu ;*.