Just the tricky consonants from Wikipedia:IPA for Vietnamese.
Implosive
ɓ Voiced bilabial implosive bạn you
ɗ Voiced alveolar implosive đuôi tail
Nasal
ɲ Palatal nasal nhà house
ŋ
Velar nasal ngà ivory "... the sound of ng in English sing."Retroflex
ʂ Voiceless retroflex sibilant (southern dialects) sữa milk
ʈ͡ʂ Voiceless retroflex affricate
Fricative
ɣ Voiced velar fricative ghế chair
x Voiceless velar fricative không not
Sibilant
ʐ Voiced retroflex sibilant rô diamond
ʒ Voiced palato-alveolar sibilant (English) vision