Hi anh Hieu and all, > Theo kinh ngie^m. cua? O^ng To+ Ba` Nguye^t.thi` ve ke^u la` ve ddu+c.!!! DDu'ng dda^'y,nhu+ng to^i thi` nha^.n ra no' nho+` kinh nghie^.m da^n da~ ho+n.Ho^m di'nh ddu'o'.c 1 "chi." ve ca'i,cha? ke^u gi` ca?,tha^'y trong bu.ng toa`n tru+'ng. Cheers. --Tua^'n.