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`1.` There are 54 ethnic groups in Vietnam.

`-` Dẫn chứng: Vietnam is a multiethnic country with 54 ethnic groups. 

`2.` The Kinh people mostly live in the Red River delta, the central coastal delta, the Mekong delta and major cities. 

`-` Dẫn chứng: The Viet (Kinh) people account for 87% of the country’s population and mainly inhabit the Red River delta, the central coastal delta, the Mekong delta and major cities. 

`3.` The population of the Tay is about 1 million.

`-` Dẫn chứng: Among ethnic minorities, the most populated are Tay, Thai, Muong, Hoa, Khmer, Nung... with a population of around 1 million each

`4.` Brau, Roman, Odu are ethnic groups have the smallest population.

`-` Dẫn chứng: ...while the least populated are Brau, Roman, Odu with several hundred people each.

`5.` The main economic activity of most ethnic peoples is wet rice cultivation. 

`-` Dẫn chứng: The main economic activity of most ethnic peoples is wet rice cultivation. 

`6.` No, they don't

`-` Dẫn chứng: Each group has its own culture that is diverse and special. 

`7.` The culture of each ethnic group is diverse and special.

`-` Dẫn chứng: Each group has its own culture that is diverse and special.