Perhaps you should try some spelling variations:
ghana health » data health
china health » china's health, child health, capita health
zhang yan » zhang fan, zhang jian, wang yan
young man » young men, young woman, young male
sang min » sang minh, tang min, chang min
song min » song ming, gong min, jong min

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

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