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

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

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