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Please read:

Nikky Nguyen, one of the three Vietnamese overseas volunteers of this group, said that for a long time it was her wish to come back to Viet Nam and make contributions to the development of the country.

1/Will you write three Vietnamese overseas volunteers or three overseas Vietnamese volunteers? Why? What is the difference in menaing btw them?

2/Will you write for a long time or for long time? Why? What is the difference in menaing btw them?

3/Will you writemake contributions or make the contributions ? Why? What is the difference in menaing btw them?

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The original is OK.

1/Will you write three Vietnamese overseas volunteers
Yes, IMO, because their mainly characteristic is being from overseas.

2/for long time? Not idiomatic.

3/make the contributions ?
Wrong, it could mean in this context "all the contributions."
She's just doing "some contributions" or "contributions."
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