This is the 55th most frequent Vietnamese word.
mỹ
"Beautiful" or "America" (depending on context).
Here, 'mỹ' refers to the United States (often abbreviated in Vietnamese as 'Mỹ'), representing a country name.
Hoa Kỳ được gọi là nước Mỹ trong tiếng Việt.
The United States is called 'nước Mỹ' in Vietnamese.
In this sentence, 'mỹ' forms a part of 'mỹ thuật', which means 'fine arts', indicating an art form focused on aesthetics and beauty.
Tôi thích thưởng thức nghệ thuật mỹ thuật tại viện bảo tàng.
I enjoy appreciating fine arts at the museum.
Here, 'mỹ' is used as part of 'mỹ miều', meaning 'charming' or 'beautiful', an adjective describing her smile.