Cov koob yees duab cov ntaub ntawv yog cov khoom siv uas ntes cov duab hauv lub sijhawm tiag tiag kom koj tuaj yeem tso cov duab ntawd rau cov neeg tuaj saib coob, xws li cov neeg tuaj koom lub rooj sib tham, cov neeg koom nrog, lossis cov tub ntxhais kawm hauv chav kawm.Hauv chav kawm, muaj ntau txoj hauv kev los siv cov koob yees duab cov ntaub ntawv thiab tau txais ntau yam ntawm nws....
Nyeem ntxiv