Chào bạn, hãy đặt tiêu đề theo mẫu [Tiền tố] + [Lớp] + Nội dung nhé!
https://diendan.hocmai.vn/threads/luc-tu-tac-dung-len-doan-day-dan-mang-dong-dien.660835/
https://diendan.hocmai.vn/threads/luc-tu-tac-dung-len-doan-day-dan-mang-dong-dien.660835/