Sao toi Nap 20k the viette lai ko duoc nhan 80 knb , chi quy doi thanh 40 knb voi 90 srr 90 srr thi lam sao toi doi duoc 40 knb vay la an chan cua khách hang roi con gi! Tien toi bo ra nhu nhau sao ko duoc nhan knb nhu nhau?