Perhaps you should try some spelling variations:
burned patients » burnt patient, surgery patients
patients risk » patient risk, patients links, patients si
among east » among breast, among ers, among health
yang yang » wang yang, wang yan
yang jin » yang jie, yang jun, ying jin
wang » wing, wan

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 OR lang) yanling ((yang jin) OR (yang yang)) burned patients risk among east ;~.
• Adding a wildcard symbol may retrieve word variants: (wang or lang) yanling ((yang jin) or (yang yang)) burned patients risk among east ;*.