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
wang dan » wang yan, wang ban, wang yidan
tang min » chang min, sang minh, yang mind
yang jin » yang jie, yang jun, ying jin
tang » thang
tan » than

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 ((tang min) or (yang jin)) hong tan ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang dan china health gain ((tang min) OR (yang jin)) hong tan ;.
• Adding a wildcard symbol may retrieve word variants: wang dan china health gain ((tang min) or (yang jin)) hong tan ;*.