Em gui cac anh chi, cac ban giao trinh Nen mong trong dieu kien phuc tap cua thay Nguon.
http://uploading.com/files/done/b27eae1d/
Co van de gi em se thong bao voi lop
Pham Hieu
http://uploading.com/files/done/b27eae1d/
Co van de gi em se thong bao voi lop
Pham Hieu