chau chao cac thay a, chau k hieu la lam cach nao chau co ve nhung phu chu nhu the, ve duoc nhu the kho qua cac thay a, ma ve sai thi nguy hiem khon luong, chau muon biet, chau co the in nhung phu chu nay ra va dung duoc k a? va khi in ra thi phu nay co cong dung k a? hay la phai tu hoc den khi nao co the ve giong y chang a? xin cac thay chi giao giup chau, da ta cac thay.