How to search/filter the filename fuzzy

There's no built-in fuzzy search ... because it will probably raise too many irrelevant results.
If you enter quick find in regexp mode, you could type ^a.*b.*c.* to get everything starting with an a also containing (somewhere after a) a b and then (somewhere after b) a c.

You can find implementation of fuzzy search in this forum for folder aliases if I remember correclty (I'll add the link if I can find it back). But this is a custom implementation for a specific need with a specific algorithm.

EDIT:

And another related post: