# Trong đó (có): of which in Vietnamese (B2)

> Trong đó (in which, of which) follows a total and singles out a part of it: Đoàn có 30 người, trong đó có 12 bác sĩ.

Source: https://vietnamesebuddy.com/grammar/trong-do/ · Updated 2026-10-17

**of which**

Pattern: `[total], trong đó + (có) + [part]`

Level: B2 (our estimate) · Register: formal

Typed without accents: trong do (co)

*Trong đó* (in which, of which) follows a total and singles out a part of it: *Đoàn có 30 người, trong đó có 12 bác sĩ.* The delegation has 30 members, 12 of them doctors. It comes after a comma, and the part follows, very often with *có*.

It's how Vietnamese reports break a figure down: *Cả nước ghi nhận 120 ca mắc, trong đó 3 ca tử vong.* There were 120 cases nationwide, three of them fatal. Without *có*, the part can be a statement with its own verb: *trong đó 37 mẫu không đạt* (of which 37 samples failed).

It also introduces the most important item in a list: *nhiều giải pháp, trong đó quan trọng nhất là …* (several solutions, the most important being …). And in a paper, *trong đó* explains the letters in a formula, like English "where".

Compare *bao gồm* (including, consisting of), which lists what a total is made up of. *Trong đó* picks out one part and leaves the rest unnamed.

You meet it constantly in news statistics, official reports and papers. It isn't only written, though: *Lớp em có 20 người, trong đó có 5 người nước ngoài* is natural in careful speech. In a quick chat, people might just say *Lớp em 20 người, có 5 người nước ngoài.*

## Examples

- Đoàn công tác gồm 25 người, trong đó có 8 chuyên gia nước ngoài. — The working delegation is made up of 25 people, including 8 foreign experts.
- Cơ quan chức năng đã kiểm tra 420 mẫu thực phẩm, trong đó 37 mẫu không đạt yêu cầu. — The authorities tested 420 food samples, 37 of which failed to meet the standard.
- Tỉnh có 15 trường đại học, trong đó 4 trường là trường tư thục. — The province has 15 universities, 4 of them private.
- Y = a + bX, trong đó Y là chi tiêu và X là thu nhập hộ gia đình. — Y = a + bX, where Y is spending and X is household income.

## Compare

- [Consisting of, including: bao gồm](https://vietnamesebuddy.com/grammar/bao-gom/): including / consisting of

Previous in News, official and academic writing: [Most of, the majority: phần lớn, đa số](https://vietnamesebuddy.com/grammar/phan-lon/)
Next in News, official and academic writing: [On the part of: về phía](https://vietnamesebuddy.com/grammar/ve-phia/)

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