Peb muaj cov khoom siv uas tuaj yeem kuaj qhov kev ua tau zoo ntawm peb cov khoom.

Xws li kev ntseeg siab ntawm cov khoom siv raw, cov ntaub ntawv siv lub cev thiab cov tshuaj tiv thaiv kev ua haujlwm ntawm cov khoom.