Try searching for your topic and the country that you are researching in Summon.
For example, if your topic is pollution, try searching for pollut* which searches for pollute or pollutes or pollution.
Also consider searching for synonyms or similar concepts.
For example, if your topic is income inequality, try searching for income inequality or wealth distribution or income distribution.
These are some sample books that you can find in the library about countries or regions and their economic development.