How to say in Czech: He speaks only a little Vietnamese.

English
speaks only a little
Czech
On mluví jen trochu vietnamsky.
He speaks 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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