Perhaps you should try some spelling variations:
china health » china's health, child health, capita health
health gain » health goals
dan china » can china, han china, dan china's
yang mind » yang cindy, sang minh, tang min
hong than » hong tan, long thanh, hong hai
wang dan » wang yan, wang ban, wang yidan
yang jin » yang jie, yang jun, ying jin

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang dan china health gain ((yang mind) or (yang jin)) hong than ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang dan china health gain ((yang mind) OR (yang jin)) hong than ;.
• Adding a wildcard symbol may retrieve word variants: wang dan china health gain ((yang mind) or (yang jin)) hong than ;*.