How to say in Czech: My Vietnamese is very good.

English
is very good.
Czech
Moje vietnamština je velmi dobrá.
I do not speak Vietnamese very well.
You speak Vietnamese very well.
My Vietnamese is getting better.
How good is your Vietnamese?
My native language is Vietnamese.
He is learning Vietnamese.
Is he learning Vietnamese?
Is he learning Vietnamese on his own?
Vietnamese is a difficult language.
Vietnamese is difficult.

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