Omnilert Engage provides a search mechanism to search the text of past engagements.
Simply type the desired search string into the Search Engagements tool and click the spyglass icon to search.
Note that the Engage view defaults to display only the "Open" engagements. These are the currently active, ongoing engagements.
You can adjust the selection to search Archived (past) engagements or set to All to search through both the open and archived engagements.