How do you say “sign language” in Vietnamese?

Vietnamese words for “sign language”

• ngôn ngữ ký hiệuListennoun
  ngôn level ngữ creaky rising ký rising hiệu heavy

  sign language

  for “sign language” meaning: The sign language (sense 1) that is used locally or that is mistakenly believed to be the only one.

• ngôn ngữ kí hiệuListennoun
  Hanoi [ŋon˧˧ ŋɨ˦ˀ˥ ki˧˦ hiəw˧˨ʔ] · Saigon [ŋoŋ˧˧ ŋɨ˨˩˦ kɪj˦˥ hiw˨˩˨]ngôn level ngữ creaky rising kí rising hiệu heavy

  sign language

  for “sign language” meaning: The sign language (sense 1) that is used locally or that is mistakenly believed to be the only one.