How to say in Czech: Where did you learn Vietnamese?

English
Where did learn
Czech
Kde ses naučil vietnamsky?
Are you learning Vietnamese?
Are you learning Vietnamese on your own?
I am learning Vietnamese.
Do you speak Vietnamese?
How do you say that in Vietnamese?
You do not speak Vietnamese very well.
I do not speak Vietnamese.
Does anybody here speak Vietnamese?
You speak Vietnamese very well.
How good is your Vietnamese?

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