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

English
is getting better.
Czech
Jejich vietnamština se zlepšuje.
I do not speak Vietnamese very well.
You speak Vietnamese very well.
How good is their Vietnamese?
Their Vietnamese is very good.
Their native language is Vietnamese.
Are they learning Vietnamese on their own?
He is learning Vietnamese.
Is he learning Vietnamese?
Vietnamese is a difficult language.
Vietnamese is difficult.

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