How to say in Czech: Are you learning Vietnamese on your own?

English
Are learning on your own?
Czech
Ty se učíš vietnamsky jako samouk?
Are you learning Vietnamese?
They are learning Vietnamese.
Where did you learn Vietnamese?
How good is your Vietnamese?
Your Vietnamese is getting better.
Your Vietnamese is very good.
Do you speak Vietnamese?
You speak Vietnamese very well.
How do you say that in Vietnamese?
You do not speak Vietnamese very well.

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