How to say in Czech: They do not speak Vietnamese.

English
do not speak
Czech
Oni nemluví vietnamsky.
They do not speak Vietnamese very well.
Do they speak Vietnamese?
They speak only a little Vietnamese.
They speak Vietnamese.
They speak Vietnamese fluently.
They speak Vietnamese very well.
Does anybody here speak Vietnamese?
Where did they learn Vietnamese?
Are they learning Vietnamese?
Are they learning Vietnamese on their own?

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