Perhaps you should try some spelling variations:
patient risk » patients risk, patient task, patient cost
bond patient » bond payment, und patient, based patient
among east » among breast, among ers, among health
yang yang » wang yang
yang jun » yang jui, pang jun, yang judy
yang jin » yang jie, ying jin, shang jin
wang » wing, wan, lang

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 yan ((((yang jun) OR (yang jin))) OR (yang yang)) bond patient risk among east ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan ((((yang jun) OR (yang jin))) or (yang yang)) bond patient risk among east ;~".
• Adding a wildcard symbol may retrieve word variants: wang yan ((((yang jun) OR (yang jin))) or (yang yang)) bond patient risk among east ;*.