Perhaps you should try some spelling variations:
ghana health » china health, data health
health gain » health goals
yan ghana » yan guan, yan zhang
yang mind » yang cindy, yang jin, sang minh
wing yan » wang yan, wing ian, wing tan
yang jun » yang jui, pang jun, yang jin
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 ((yang mind) or (yang jun)) hong tan ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wing yan ghana health gain ((yang mind) OR (yang jun)) hong tan ;*.