How do you say “once and for all” in Vietnamese?

Vietnamese words for “once and for all”

• mãi mãiListenadverb
  Hanoi [maːj˦ˀ˥ maːj˦ˀ˥] · Saigon [maːj˨˩˦ maːj˨˩˦]mãi creaky rising mãi creaky rising

  for a very long time; always and always; forever

  for “once and for all” meaning: Conclusively, finally, permanently.

• vĩnh viễnListenadjective
  Hanoi [vïŋ˦ˀ˥ viən˦ˀ˥] · Saigon [vɨn˨˩˦ viəŋ˨˩˦]vĩnh creaky rising viễn creaky rising

  everlasting; long-lasting; permanent

  for “once and for all” meaning: Conclusively, finally, permanently.