How do you say “federation” in Vietnamese?

Vietnamese words for “federation”

• liên bangListennoun
  Hanoi [liən˧˧ ʔɓaːŋ˧˧] · Saigon [liəŋ˧˧ ʔɓaːŋ˧˧]liên level bang level

  a federation; a confederation

  for “federation” meaning: An array of nations or states that are unified under one central authority.

• liên đoànListennoun
  Hanoi [liən˧˧ ʔɗwaːn˨˩] · Saigon [liəŋ˧˧ ʔɗwaːŋ˨˩]liên level đoàn falling

  a union

  for “federation” meaning: Any society or organisation formed from separate groups or bodies.

• liên hiệpListenverb
  Hanoi [liən˧˧ hiəp̚˧˨ʔ] · Saigon [liəŋ˧˧ hip̚˨˩˨]liên level hiệp heavy

  to ally; to unite; to combine

  for “federation” meaning: Any society or organisation formed from separate groups or bodies.