It is usually a good idea to start out broadly, so using just one or two of your topic terms is a good way to begin. Once you have a set of results, you can begin narrowing down your results by entering one or more terms. Searching in a specific field such as "Subject" or "Title" will narrow or focus your results.
Accessible from the Library homepage, the Statista database is a portal to statistical information that includes country information, pulling together data on over 80,000 topics from over 18,000 sources onto a single platform. Search for a country to view a variety of statistics.