Cov qhov rooj hluav taws uas tsis tu ncua muaj lawv tus kheej “tus lej”. Tus lej no tseem ceeb heev. Nws tsis tsuas yog piav qhia txog qhov ntsuas hluav taws kub ntawm lub qhov rooj hluav taws, cov khoom siv hluav taws xob thiab cov chaw tsim khoom thiab lwm yam ntaub ntawv, tab sis kuj muaj lub logo lees paub los ntawm lub tuam tsev tua hluav taws. Muaj “HS” code nyob rau hauv daim ntawv tshaj tawm kev lis kev cai, txais tos sab laj nrog peb.