Perhaps you should try some spelling variations:
ghana health » china health, data health
health gain » health goals
hyoung tan » hyoung gun, young man, hong tan
yan ghana » yan guan, yan zhang
sang minh » kang minah, anh minh, song ming
song min » song ming, gong min, jong min
wang » wing, wan, lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yan ghana health gain ((sang minh) or (song min)) hyoung tan ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan ghana health gain ((sang minh) OR (song min)) hyoung tan ;.
• Adding a wildcard symbol may retrieve word variants: wang yan ghana health gain ((sang minh) or (song min)) hyoung tan ;*.