Perhaps you should try some spelling variations:
ghana health » china health, data health
health gain » health goals
yan ghana » yan guan, yan zhang
wing yan » wang yan, wing ian, wing tan
tang min » chang min, sang minh, yang mind
ying jin » yang jin, jing ji, yang jie
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: wing yan ghana health gain ((tang min) or (ying jin)) hong tan ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wing yan ghana health gain ((tang min) OR (ying jin)) hong tan ;.
• Adding a wildcard symbol may retrieve word variants: wing yan ghana health gain ((tang min) or (ying jin)) hong tan ;*.