ti"khoiln Ill\l" chi phi.phi,p ph:"1I)11,\chi phi t"i tnr(-'- I'h,;n h." chi phi ,u ,hmg ,,' j>inh (i,,,: (ii{1 trj V" hinh gns ,\ \'an chi phi ,an xu,\\kinh ,I;",h 11>,'"ph'll!llg ph,.,p dui1l1g 11,~ngdua lrcn th,'" gi,lIJ huu dlmg u,'c tinh Iii 15 nam thc" dmg van s(\ 7640/C\-'-1ITC[r]