Perhaps you should try some spelling variations:
ghana health » china health, data health
health gaps » health gap, health goals, health gains
yang liang » wang liang, yang yang, peng liang
man ghana » man han
yan liang » wang liang, you liang, yan wang
dang hadi » dang hai
ying jin » yang jin, jing ji, yang jie
kann » ann

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

• If you are trying to use Boolean operators, they must be ALL CAPS: kann man ghana health gaps ((((yang liang) OR (yan liang))) OR (ying jin)) dang hadi ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "kann man ghana health gaps ((((yang liang) OR (yan liang))) or (ying jin)) dang hadi ;~".
• Adding a wildcard symbol may retrieve word variants: kann man ghana health gaps ((((yang liang) OR (yan liang))) or (ying jin)) dang hadi ;*.