How do you say “empress dowager” in Vietnamese?

Vietnamese words for “empress dowager”

• hoàng thái hậuListennoun
  Hanoi [hwaːŋ˨˩ tʰaːj˧˦ həw˧˨ʔ] · Saigon [waːŋ˨˩ tʰaːj˦˥ həw˨˩˨]hoàng falling thái rising hậu heavy

  empress dowager

  for “empress dowager” meaning: The mother or widow of an emperor, especially in a Chinese, Japanese, Korean or Vietnamese empire.

• thái hậuListennoun
  Hanoi [tʰaːj˧˦ həw˧˨ʔ] · Saigon [tʰaːj˦˥ həw˨˩˨]thái rising hậu heavy

  queen dowager; queen mother; empress dowager

  for “empress dowager” meaning: The mother or widow of an emperor, especially in a Chinese, Japanese, Korean or Vietnamese empire.