Perhaps you should try some spelling variations:
ghana health » china health, data health
health gain » health goals
zhang ming » zhang xin
young male » young males, young age
yan ghana » yan guan, yan zhang
sang minh » kang minah, anh minh, song min
chang min » chang mae, chan ming, chang ann
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 (((chang min) OR (zhang ming)))) young male ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan ghana health gain ((sang minh) OR (((chang min) OR (zhang ming)))) young male ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan ghana health gain ((sang minh) or (((chang min) OR (zhang ming)))) young male ;".
• Adding a wildcard symbol may retrieve word variants: wang yan ghana health gain ((sang minh) or (((chang min) OR (zhang ming)))) young male ;*.