Which Vietnamese word makes you hot if you add a question mark and cool if you remove it?

Think carefully to find out which Vietnamese word with a question mark is hot, and without a question mark is cool?

Despite being the mother tongue, Vietnamese has never been “easy”. There are many tricky riddles that even 100% Vietnamese people have to “give up” because they are so tricky.

If you find the answer to the above puzzle in the shortest time, scroll down to the comments to record and see how many people think the same as you.

Libra

Source: https://vtcnews.vn/tu-tieng-viet-nao-them-dau-hoi-thi-nong-bo-hoi-thi-mat-ar965158.html