Cam on Duc Khai. Ban gui luon cho toi link sach khai niem ve chien thuat khai cuc va trung cuc nhe. Cam on ban nhieu. Lan truoc toi chep ve roi sau do may bi virut nen khong con. Dia chi cua toi : tranhoang699@gmail.com
Mot lan nua cam on Duc Khai!!!