The official language of Hotels In Vietnam is . Like Thai and Mandarin, Vietnamese is a tonal language that uses a change in pitch to inflict different meanings, and this can make it difficult for Westerners to master. While it is very different from Western languages, a traveler may be surprised to learn that the basic grammar is pretty simple. Verbs are static regardless of the past or future and parts of speech are pretty straightforward. The major difficulties lay on tones and certain sounds.