How do you say “colloquial” in Vietnamese?

Vietnamese words for “colloquial”

• thông tụcListenadjective
  Hanoi [tʰəwŋ͡m˧˧ tʊwk͡p̚˧˨ʔ] · Saigon [tʰəwŋ͡m˧˧ tʊwk͡p̚˨˩˨]thông level tục heavy

  colloquial; popular; vulgar

  for “colloquial” meaning: Characteristic of familiar conversation, of common parlance; informal.

• bình dânListenadjective
  Hanoi [ʔɓïŋ˨˩ zən˧˧] · Saigon [ʔɓɨn˨˩ jəŋ˧˧]bình falling dân level

  popular; including a degree of informality

  for “colloquial” meaning: Characteristic of familiar conversation, of common parlance; informal.