It is possible, If you're on vB4, you'd be best off looking at sphinx from digitalpoint's market. You can either signup for a paid membership, or buy it outright.

Sphinx doesnt work with vB3 ?

You'd have to custom code an application, or do some custom hacking. I doubt the old versions are still working considering how much further sphinx has come since 2006~

https://vborg.vbsupport.ru/showthrea...ghlight=sphinx

And with fulltext mysql search, i suppose there is no way to limit ft_min_word_len to 4 *but* allow 3 characters search on specific words ?

Not easily.