Is 'as regular as clockwork' or 'as regular as clockwork' the correct idiom?

Although it is a familiar idiom, often used in daily life, when asked, many people are confused and uncertain about whether "nhe nhu yeu chanh" or "nhe nhu yeu tranh" is the correct spelling.

According to experts, this idiom is often used to describe regularity and repetition in an action or event.

So, what do you think is the correct original version of this proverb? Leave your answer in the comment box below.

Kim Nha

Source: https://vtcnews.vn/deu-nhu-vat-chanh-hay-deu-nhu-vat-tranh-moi-chuan-thanh-ngu-ar906449.html