tat ca cac bac noi sai het
theo em thi cu tu tu lam tu chuyen mach ang ten rui quan trong la cau tat loc thu nhe tiep den kho nong pa ko con nao k khoi
ve phan song thi no co nhieu nguyen nhan do la co the mat nguon cap cho khoi thu va phat .neu ban kiem tra cs va trung tan loc ma tot thi nen kiem tra nguon cap co the khach lam rot no ho chan thi sao ma 1110i thi lam j co chuyen mach ant