In general … in particular: X nói chung, Y nói riêng

X nói chung và Y nói riêng means "X in general and Y in particular". X is the wide field, and Y is the part of it the writer wants to focus on: nông nghiệp nói chung và ngành trồng lúa nói riêng, agriculture in general and rice growing in particular. Each label comes straight after its own noun.

The order can be turned round, with the narrow part first: Đà Nẵng nói riêng và miền Trung nói chung, Đà Nẵng, and central Vietnam as a whole. In headings and long sentences, a comma often takes the place of và: Người lao động nói chung, công nhân nói riêng … The pair often follows đối với (for), cho or trong.

You'll meet it constantly in news reports, official speeches and university papers; thesis titles and introductions are full of it. It's a set piece of formal writing, and English usually translates it more loosely: "for agriculture, and for rice farmers above all".

In conversation it sounds like a press release. There, people pick out the part with nhất là or đặc biệt là (especially): Nông dân khổ lắm, nhất là người trồng lúa. Farmers have it hard, especially rice farmers. And don't confuse it with nói chung on its own at the start of a sentence, which means "all in all": Nói chung, công việc cũng ổn.