(I) (am) try(ing) to write (an) email.

Dear Ms.Hoa

I  (am) send(ing) (a) disbursement report for each (member) (of) (your) staff in (the) Ho Chi Minh area.
Please (see attached file for details).
(If clarification is needed, please do not hesitate to ask).

Thank(s) for your help!

(Sincerely),

Dear Ms.Hoa

I am sending (I am attaching) a disbursement report for each member staff in the Ho Chi Minh area.
Please find more details in the attached file. 
Let me know if anything is unclear

Best regards,
YOUR NAME

Dear Ms.Hoa

I send a disbursement report for each staff in Ho Chi Minh area. Please find the details in the attached file.

Please let me know if anything is unclear.

Thank you for your help!

Best and regards,

*your name*