des savoir-faire

Hi, I've learned some compound words like 'savoir-faire', but
I'm not so sure how to put it in plural form..:(

My best guess is 'savoirs-faires', but somehow I feel that
'savoirs-faire' could be the answer as well...

Oh, and I'd also appreciate it if someone could explain the rule of
making plurals with compound words, if there are any. :)

Merci d'avance!
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