Problem with exact word search

Hi, when I search by exact word I noticed this problem.
I have to look for the word pescara, and up to here everything is ok, but if I then try to pescare or pescari or pescaro, it still finds the same documents without highlighting any words, but this does it only change the last letter with E I O while not with all the others, how can I solve this problem?

What I want is that if I search for “pescare” with exact word search it shouldn’t find me anything

P.S. fuzzy search is already set to -1

Please check past topics.