If there is a topic you'll be researching for the entire semester, or longer, you can set up Saved Searches for the topic, and receive alerts when new items are added to the database that match your search terms.
If you have found a set of search terms that returns great results, you can save it using the Save Query option at the top of the search results list.
To see your saved searches, click the Pin icon at the top of the page next to the Sign In link, then choose the Saved Searches tab.
When you are looking at your Saved Searches, you have the option to set an alert for the search. This will send you an email notification when new items are added to the database that match your search terms.
You also have the option to add an RSS feed for your saved search to an RSS reader.
You can view the search history for your current session here, as well, if there was a search that you did and you can't remember what terms you used. Your search history will only remember your searches for your current session and will be deleted as soon as you close the browser.