Thank you for the stuffs you gave me OR
Thank you for the stuffs
Neither one is good. "Stuff" is used in the singular, and it is not polite. Thank you for your gifts.
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Neither one is good. "Stuff" is used in the singular, and it is not polite.
Thank you for your gifts.
Thank you for the things you gave me.
Susie put all her stuff in my room! Now my room is a mess.