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

English
Where did learn
Czech
Kde se naučil vietnamsky?
He is learning Vietnamese.
Is he learning Vietnamese?
Is he learning Vietnamese on his own?
Does he speak Vietnamese?
He does not speak Vietnamese.
He does not speak Vietnamese very well.
He speaks only a little Vietnamese.
He speaks Vietnamese.
He speaks Vietnamese fluently.
He speaks Vietnamese very well.

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