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thoai thong » thoai trong, thong thong, toan thong
hanh trinh » canh tranh, hanh chinh
khoa thoai » hoa thai, hoi thoai, khoa than
trinh thi » trinh tai, dinh thi, trinh tu
sach thai » sach tham, sac thai, sach tai
cac khoa » cac khoan, cac khoi, cao khoa
thu sach » tu sach, thuat sach, thuoc sach
thai tan » thai tran, thai tang, thai van
dac khoa » da khoa, dai khoa, dau khoa
tu hanh » du hanh, lu hanh, thuc hanh
thi cac » thi cuc, tai cac, thi tac
khoa he » hoa he, khoa hoc, khong he
tan dac » ban dac, gian dac, toan dam