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

English
do not speak very well.
Czech
Oni nemluví moc dobře vietnamsky.
They speak Vietnamese very well.
They do not speak Vietnamese.
Do they speak Vietnamese?
They speak only a little Vietnamese.
They speak Vietnamese.
They speak Vietnamese fluently.
Does anybody here speak Vietnamese?
Your Vietnamese is very good.
Your Vietnamese is getting better.
How good is your Vietnamese?

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