Perhaps you should try some spelling variations:
based patient » based payment, based payments
patient cost » patient care
cost among » costs among, out among, test among
among east » among breast, among ers, among health
yang yang » wang yang
yang jun » yang jui, pang jun, yang 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 yang)) based patient cost among east ;~.
• Adding a wildcard symbol may retrieve word variants: wang yan ((yang jun) or (yang yang)) based patient cost among east ;*.