Ovid databases that allow mapping searches to subjects include: Medline, EMBASE, EMCare, Maternity & Infant Care Database (MIDIRS), AMED (Allied and Complementary Medicine), and PsycINFO.
Three indexed online tutorials providing an overview and demonstration of Cochrane Library:
These videos are free to view, but require a guest sign up (no personal information).
Sample PsycINFO search
Finding peer-reviewed empirical articles in PsycINFO