Here are the plural forms of the given nouns:

1. The **women** in Viet Nam wear traditional clothing called Ao Dai.
2. The ethnic **minorities** in Viet Nam have unique cultures and traditions.
3. The **boys** in the H’mong tribe learn to play traditional musical instruments.
4. The **knives** used by the Dao people are handmade and very sharp.
5. The women in the Tay ethnic group are skilled **weavers**.
6. The **loaves** of bread sold in the markets of Viet Nam are often made with rice flour.
7. The **mice** are considered a delicacy in some parts of Viet Nam.
8. The **salmon** in Viet Nam are mostly imported from other countries.
9. The **buses** in the cities of Viet Nam are often overcrowded.
10. The **studios** in Viet Nam produce many films and TV shows.
11. The **feet** of the Muong people are often calloused from walking barefoot.
12. The trophies won by athletes in Viet Nam are celebrated with **parades** and ceremonies.
13. The **tomatoes** grown in the highlands of Viet Nam are known for their sweetness.
14. The cats in Viet Nam are often kept as **pets** and for pest control.
15. The **sheep** are not native to Viet Nam, but can be found in some rural areas for their wool.