How to say in Czech: His Vietnamese is getting better.

English
is getting better.
Czech
Jeho vietnamština se zlepšuje.
I do not speak Vietnamese very well.
You speak Vietnamese very well.
His Vietnamese is very good.
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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