Here are some suggested terms that can be used as a keyword or in some cases as a subject* search in the library catalogue.
Enlightenment civil society
England (or the name of another country, i.e. Scotland) -- Intellectual life -- 18th century *
Diderot, Denis, 1713-1784*
Rousseau, Jean-Jacques, 1712-1778*
Historiography (Try historiography with your keywords, for example enlightenment historiography)
Theses are often great sources for extensive bibliographies on a topic.