While there are over 300 databases you can search, for English 120 you may want to try searching EBSCO: a composite of dozens of different databases, including Academic Search Complete.
After going to Ebsco All Databases, you have the option of "selecting all" databases so you can search multiple databases at once. This is great if your topic is multidisciplinary or you just don't want to miss anything!
Start browsing databases by title (E):
To cast the net of your search as wide as possible, go ahead and "select all" to navigate multiple databases simultaneously:
A few key ways to narrow your search results: