Search the listings using the country field. This search box is populated with the countries dynamically generated from states with listings listed in them. Whichever country appears in the dropdown is an actual country that a listing is located in. If the country is not in the list there is no use searching for listings in that country.
Results are returned if they match the condition of your search text statement and having this country or if only a country is chosen then every listing within that country is returned.