Perhaps you should try some spelling variations:
ghana health » data health
china health » china's health, child health, capita health
min hyoung » min hong, mun young
hyoung gun » young eun
gain sang » shin sang, gain sharing
sang min » sang minh, song min, tang min
wang » wing, 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 or wan) yan ((ghana health) or (china health)) gain sang min hyoung gun ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (wang OR wan) yan ((ghana health) OR (china health)) gain sang min hyoung gun ;.
• Adding a wildcard symbol may retrieve word variants: (wang or wan) yan ((ghana health) or (china health)) gain sang min hyoung gun ;*.