Perhaps you should try some spelling variations:
china health » china's health, child health, capita health
health gain » health goals
yang mind » yang cindy, sang minh, tang min
wang can » wang yan, wang ban, wang dan
yang jin » yang jun, ying jin, shang jin
yang jie » yang di, yang jui, yang xi
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 mind) OR (((yang jin) OR (yang jie)))) hong tan ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang can china health gain ((yang mind) or (((yang jin) OR (yang jie)))) hong tan ;~".
• Adding a wildcard symbol may retrieve word variants: wang can china health gain ((yang mind) or (((yang jin) OR (yang jie)))) hong tan ;*.