VB 2

http://www.culamdi.com/2014/11/23/tong-ket-chung-ve-mon-pronunciation-phat-am/

http://www.culamdi.com/2016/03/30/giao-trinh-hoc-ky-1-ngu-van-anh-vb2-xhnv-hcm-update-2016/