4.Video bài giảng từ 21-40

21.
http://www.fileserve.com/file/9MV6JdJ

22.
http://www.fileserve.com/file/9MpSBAb

23.
http://www.fileserve.com/file/PrTgCnp

24.
http://www.fileserve.com/file/rjvqRXu

25.
http://www.fileserve.com/file/zMWSxFP

26.
http://www.fileserve.com/file/H5BvMgB

27.
http://www.fileserve.com/file/mtuAhHE

28.
http://www.fileserve.com/file/Rcnw6rM

29.
http://www.fileserve.com/file/RRptY69

30.
http://www.fileserve.com/file/YsFZJss

31.
http://www.fileserve.com/file/h7s5dcC

32.

http://www.fileserve.com/file/ZKn7ypT

33.
http://www.fileserve.com/file/gUUzDtE

34.

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

35.

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

36.
http://www.fileserve.com/file/Rg7DAVx



37.
http://www.fileserve.com/file/gEt2emy



38.
http://www.fileserve.com/file/xKuEkBk

39.
http://www.fileserve.com/file/a5QasCE

40.
http://www.fileserve.com/file/jdyuNVh