This is the 585th most frequent Vietnamese word.
nào
The Vietnamese word "nào" means "which," "what," or "any" depending on context, and it can also be used to express urging or emphasis.
Here, 'nào' is used as a question particle indicating the selection inquiry.
Bạn thích quyển sách nào?
Which book do you like?
In this case, 'nào' is used to express an urging or calling out to action.
Chúng ta sẵn sàng đi nào!
Let's get ready to go!
Here, 'nào' is employed in a generalizing sense to refer to any item in the category.