Best bets are Academic Search Complete and Medline
Enter your terms as keywords, for example:
Haiti AND health AND econom*
Ukraine AND women's health
Luxembourg AND nutrition
Why did I use an * after econom? Because it brings back results with all the various endings: economy, economic, economics, etc. This will increase your pool of results.
You will be able to refine your results by using Limiters. In the area that says Limit Your Results you will find some helpful options:
Need demographic information to develop the background on your country?
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