The Search History tab shows you the searches you have conducted in that session. You can combine results sets to make more narrow (using AND) or more broad (using OR) search results.
For an example, do a cited reference search for Cooil b or cooil bruce. Select all results and click Finish Search.
Then do a Topic search for film* or movies or television.
Go to the Search History tab, select those 2 results sets with the operator AND. Click Combine.
Search history screen:
