3.Video bài giảng từ 11-20

 11.
http://www.fileserve.com/file/HqTjGQf

12.
http://www.fileserve.com/file/ZhXmVjA

13.
http://www.fileserve.com/file/Nyh2u9B

14.

http://www.fileserve.com/file/wsHdUgF

 15.
http://www.fileserve.com/file/EpX89Ub

16.
http://www.fileserve.com/file/t3vNnjH

17.
http://www.fileserve.com/file/p6sMDvH

18.
http://www.fileserve.com/file/tsBCS4U

20.
http://www.fileserve.com/file/8Z6qj33