chao chi Hien Trang,
thi TOEFL ibt kho hon rat nhieu so voi pbt, vay chung ta khong the thi the PBT cu sao chi? cac USA Universities khong chap nhap PBT hay la o VN ko con thi PBT nua? Em thay
http://www.ets.org/ van con PBT?
chi cho em vai thong tin . Thanks a lot