How to say in Czech: They speak only a little Vietnamese.

English
speak only a little
Czech
Oni mluví jen trochu vietnamsky.
Do they speak Vietnamese?
They do not speak Vietnamese.
They do not speak Vietnamese very well.
They speak Vietnamese.
They speak Vietnamese fluently.
They speak Vietnamese very well.
Does anybody here speak Vietnamese?
Are they learning Vietnamese?
Are they learning Vietnamese on their own?
They are learning Vietnamese.

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