T? k? c?ng cn g?i l ch?ng R?i lo?n ph? t? k?. ?y l m?t d?ng r?i lo?n pht tri?n x?y ra ? t?t c? m?i ng??i thu?c m?i gi?i tnh, ngu?n g?c v?n ho v c?ng ??ng. T? k? ?nh h??ng t?i cch m?t ng??i h?c t?p v t??ng tc v?i ng??i khc v v?i xung quanh. T?t c? m?i ng??i b? ph? t? k? ??u ring bi?t v khc nhau.
Tm ki?m ti li?u d??i ?y.