IFAN kev tswj cov khoom yog nruj me ntsis, tsis tsuas yog nyob rau hauv lub chaw soj nstuam, nyob rau hauv cov txheej txheem ntau lawm, cov neeg ua hauj lwm yeej ib txwm xyuam xim rau cov khoom tsim. Nrhiav thiab tshem tawm cov khoom puas los ntawm cov txheej txheem tsim khoom.
