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 min
sang min » song min, tang min, chang 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 min) OR (sang minh)) hyoung tan ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan ghana health gain ((sang min) OR (sang minh)) hyoung tan ;".
• Adding a wildcard symbol may retrieve word variants: wang yan ghana health gain ((sang min) OR (sang minh)) hyoung tan ;*.