+kheo leo kt xax mjh tjh chjh xax of tjn tux nhan dc do csbm cug cap truox khj dua vao su dug

+tuyet doj gju bj mat ve nguon tjn khj can su dug lam tl dau trah cog khaj can co bjen fap chuyen hoa tl 1 caxh hop ly.

6)che do chjh saxh dvoj csbm

-co hjh thux dog vjen khen thuog kip thoj ca ve tjh than va vat chat cho thjx hop

-khj csbm bj om,gja djh kho khan,taj nan...cskv faj tham hoj an can va co the de nghj tro cap dot xuat cho ho

-truog hop csbm co saj faj trog cog tax faj kjp thoj uon nan xet thay k con tax dug thj ket thux su cog tax.