Theo toi muo'n nang cao trinh do co cung nhu mot tro choi nao do' can phai hy sinh thoi gian,cong su'c,tien bac..........cho no'.Ne'u ko muo'n ma't ji ma doi dc thi ko co' dau,don gian the' thoi.Phuong pha'p nhu the' nao thi hoi nguoi di truo'c........