# Phải: (accidentally) hit on something bad in Vietnamese

> After a verb, phải means you ran into something bad by accident: ăn phải đồ hư (ate something that had gone off), mua phải hàng giả (ended up buying…

Source: https://vietnamesebuddy.com/grammar/phai-bad-luck/ · Updated 2026-10-17

**(accidentally) hit on something bad**

Pattern: `[verb] + phải + [object]`

Level: B2 (our estimate) · Register: everyday

Typed without accents: phai

After a verb, *phải* means you ran into something bad by accident: *ăn phải đồ hư* (ate something that had gone off), *mua phải hàng giả* (ended up buying fakes), *gặp phải khó khăn* (ran into difficulties). The verb comes first, then *phải*, then the unwelcome thing. English has no single word for it; "ended up", "happened to", or just the verb in context.

The thing after *phải* is always unwanted. *Gặp bạn cũ* is meeting an old friend; *gặp phải kẻ gian* is running into a crook. The same goes for *đạp phải đinh* (step on a nail) and *uống phải nước bẩn* (drink dirty water).

In Saigon speech, *trúng* often takes this place: *mua trúng hàng dỏm* (bought a dud), *đạp trúng đinh*. In Hà Nội, the verb for "step on" is *giẫm*: *giẫm phải đinh*.

News uses fixed pairs with *phải*: *mắc phải sai lầm* (make a mistake), *gặp phải sự cố* (run into a problem), *vấp phải sự phản đối* (meet opposition).

Position changes everything. Before a verb, *phải* means "must": *phải mua* is "have to buy". After the verb, *mua phải* is "bought (something bad) by mistake".

## A common mistake

✗ Hôm qua tôi phải ăn đồ hư nên bị đau bụng.

✓ Hôm qua tôi ăn phải đồ hư nên bị đau bụng.

Before the verb, *phải* means "had to". To say you ate something bad by accident, put *phải* after the verb.

## Examples

- Saigon: Hôm qua tôi ăn phải đồ hư nên đau bụng cả đêm. | Hà Nội: Hôm qua tôi ăn phải đồ ôi nên đau bụng cả đêm. — Yesterday I ate something that had gone off and had a stomach ache all night.
- Tôi mua phải hàng giả trên mạng mà không biết. — I bought fakes online without realising.
- Saigon: Thằng nhỏ đạp phải miểng chai, chảy máu chân. | Hà Nội: Thằng bé giẫm phải mảnh chai, chảy máu chân. — The little boy stepped on broken glass and cut his foot.
- Dự án gặp phải nhiều khó khăn ngay từ đầu. — The project ran into a lot of difficulties right from the start.

## Compare

- [Must, have to: phải + verb](https://vietnamesebuddy.com/grammar/phai-must/): must

Previous in Words at the start and end of a sentence: [Who else? Of course! … chứ ai, chứ gì, chứ sao](https://vietnamesebuddy.com/grammar/chu-ai-who-else/)
Next in Words at the start and end of a sentence: [So very …! Adj + ơi là + Adj](https://vietnamesebuddy.com/grammar/oi-la/)

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