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Hi teachers,
Please help me by editing the following:

Dear sirs,

I've heard that your company wants to recruit Vietnamese sales represntatives to expand your business in Vietnam.Could you possibly elaborate on the field of your company's activity so that I should know whether I am fit for it.

Respectfully yours

Thank you in advance
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.

Dear Sirs,

I have heard that your company is recruiting Vietnamese sales representatives to expand your business in Vietnam. Could you possibly elaborate on the field of your company's activity so that I can consider whether my skills and experience might be appropriate for your needs?

Respectfully yours,
Comments  
Thank you very much Mister Micawber
Your rephrasing is excellent