International relations (IR) (occasionally referred to as international studies (IS))[1] is the study of relationships between countries, including the roles of states, inter-governmental organizations (IGOs), international nongovernmental organizations (INGOs), non-governmental organizations (NGOs) and multinational corporations (MNCs). It is both an academic and public policy field, and can be either positive or normative as it both seeks to analyze as well as formulate the foreign policy of particular states. It is often considered a branch of political science (especially after 1988 UNESCO nomenclature), but an important sector of academia prefer to treat it as an interdisciplinary field of study.

Apart from political science, IR draws upon such diverse fields as economics, history, international law, philosophy, geography, social work, sociology, anthropology, psychology, women's studies/gender studies, and cultural studies / culturology. It involves a diverse range of issues including but not limited to: globalization, state sovereignty, ecological sustainability, nuclear proliferation, nationalism, economic development, global finance, terrorism, organized crime, human security, foreign interventionism and human rights. ** Wikipedia

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Sherlock (the Library Beta Search Engine) sometimes works well for International Relations Topics - it searches accross a variety of sources and handles multiple topics. For example: Counterinsurgency in Afghanistan and  in Nicaraugua. But don't use the phrase like that. I would connect the words with AND Counterinsurgency AND Afghanistan AND Nicaragua.