[Koha] Searches with "Not" in the title

[Scott Owen]

Hi all,

I'm trying to explain to one of my librarians why searching for a book
titled "Not Hungry"   (without the quotes) will bring up no results, while
searching for "hungry" (without the quotes) will bring up the book.

I'm guessing it's because "Not" is an operator...but I can't seem to find
where this is explained in the Koha docs ?? (search operators that is...)