chap 5

1 giới thiệu 

2 chap 1 

3 chap 2 

4 chap 3 

5 chap 4 

6 chap 5 

7 chap 6 

8 chap 7 [ thíu nên thêm:D ] 

9 chap 8 [ sửa lỗi chính tả;) ] 

10 chap 9 

11 chap 10 

12 chap 11 

13 chap 12 

14 chap 13 

15 chap 14 

16 chap 15 

17 chap 16 

18 chap 17 

19 chap 18 

20 chap 19 

21 chap 20 

22 chap 21 

23 chap 22 

24 chap 23 

25 chap 24 