Hom no len mang down ca buoi troi moi dc phan mem ve sach ve ky thuat nhung ko hieu sao mo ko dc.roi phai ra down lai nguyen bo cong cu cua no ve cai cung mo ko dc. Vay ban nao biet sach viet hien nay tren mang ngoai cac duoi *.pdf .*.txt. doc duoc bang phan mem. thi nhung chuong trinh khac co the doc dc ko / co gi nhan mail cho minh : mtvhuyhieu@yahoo.com