Perhaps you should try some spelling variations:
ghana health » data health
china health » china's health, child health, capita health
chang min » zhang ming, chang mae, chan ming
song ming » song bing, song min, gong min
young man » young men, young woman, young male
lang yan » wang yan, wang yang, zhang yan

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

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