Perhaps you should try some spelling variations:
selecting patients » selecting patient, select patients, selecting incidents
patients risk » patient risk, patients links, patients si
risk coping » risk pooling
wang liang » wang yang
coping shu » cong shu
yang up » yang jui, tying up, yang jun
yang xi » yang yi, yang jui

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang liang ((yang up) or (((yang xi) or (yang di)))) selecting patients risk coping shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang liang ((yang up) OR (((yang xi) OR (yang di)))) selecting patients risk coping shu ;.
• Adding a wildcard symbol may retrieve word variants: wang liang ((yang up) or (((yang xi) or (yang di)))) selecting patients risk coping shu ;*.