There is no single database or search engine available for locating theoretical scholarly literature. Start researching early to give yourself time to locate these sources. Below are some search tips for locating theory focused literature:
Another way to locate political theory/philosophy articles is by going directly to the journals rather than searching in databases. This can take longer, but almost all journals allow for keyword searching and it can make it easier to find the theoretical articles you'll need.
Be sure to use interlibrary loan to get access to articles we don't have access to through our collections.