Jumbo Search is a great place to start because it searches many of the Tisch Library's resources all at once. However, it doesn't search everything, and so using subject specific databases like the ones in the curated lists below can help you find more resources.
Some databases only provide citation information to an article or resource rather than the full text. Other times, you may find something on Google Scholar to which Tufts does not have instant access. Interlibrary loan can help provide you with access to the resources that you need with help from other libraries and universities.