How to say in Czech: He speaks Vietnamese fluently.

English
speaks fluently.
Czech
On mluví plynně vietnamsky.
He speaks only a little Vietnamese.
He speaks Vietnamese.
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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