Em mua cái này nhé bác
https://edumall.vn/course/hacker-mu-trang-va-bao-mat-thong-tin?utm_source=edm_ds_prs3&utm_pos=55&utm_cat=cong-nghe-thong-tin
https://edumall.vn/course/tieng-han-so-cap-cho-nguoi-moi-bat-dau-1472729213?utm_source=edm_ds_prs3&utm_pos=16&utm_cat=tieng-anh-nghe-thuat
giao dịch...