Search engines are one way of finding information, but it is best to use the scholarly web for, well, scholarly information. 20 Useful Speciality Search Engines for College Students is a recent blog post listing just such websites.
DOAJ and ERIC are listed and these are also available on our databases page. Intute is also listed and we at WIT Libraries Learning Support have long championed that excellent resource. Some of the websites are American focused so will be useful depending on needing US info. Google Scholar is, of course, on the list and just to remind you that it now links into WIT Libraries.
Two not on the list – Scirus, science-specific search engine and JURN, academic search engine for arts and humanities.