Which Vietnamese word is left in the sky, with the head in the mouth?

Only people with a rich Vietnamese vocabulary can solve the puzzle below.

The riddle is as follows: " Which Vietnamese word is left in the sky, but the head is in the mouth?" . This is a seemingly simple riddle, but not everyone can find the correct answer.

Which Vietnamese word is left in the sky, with the head in the mouth?

If you find the answer to the Vietnamese word "leave the whole thing in the sky, put the head in the mouth" in the shortest time, scroll down to the comments to record and see how many people think the same as you.

Khanh Son

Source: https://vtcnews.vn/tu-tieng-viet-nao-de-nguyen-nam-tren-troi-bo-dau-nam-trong-mieng-ar961904.html