If you prepare an assignment, a paper, an article, a presentation, more often than not you will have to read and exploit hundreds of sources - books, articles, research notes, PDFs, web pages, your handwritten records.
Probably most of this material sleeps on the hard disk of your computer. But how do you find a specific topic? The built-in search engine of your machine is of no great help.
This is only a tiny segment of all files. I would have to open most of the files (hundreds!) to be able to decide if they are pertinent for my paper.
In the SEARCH module, just enter search terms, separated by comma.
Because LETTRAS automatically searches for all possible combinations of your search terms in your complete knowledge base it can detect interconnections and links that you might not even have been aware of.