Perhaps you should try some spelling variations:
china health » china's health, child health, capita health
health gain » health goals
yang cindy » yang mind
wang can » wang yan, wang ban, wang dan
yang jin » yang jie, ying jin, shang jin
yang jun » yang jui, pang jun, yang judy
tan » than

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 can china health gain ((yang cindy) OR (((yang jin) OR (yang jun)))) hong tan ;~.
• Adding a wildcard symbol may retrieve word variants: wang can china health gain ((yang cindy) or (((yang jin) or (yang jun)))) hong tan ;*.