How to say in Czech: He speaks Vietnamese.

English
speaks
Czech
On mluví vietnamsky.
He speaks only a little Vietnamese.
He speaks Vietnamese fluently.
He speaks Vietnamese very well.
Does he speak Vietnamese?
He does not speak Vietnamese.
He does not speak Vietnamese very well.
Does anybody here speak Vietnamese?
He is learning Vietnamese.
Is he learning Vietnamese?
Is he learning Vietnamese on his own?

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