Qhov xav tau ntawm kev tsim khoom ntawm ib feem yog tias nyob rau hauv cov txheej txheem txheej txheem thiab qib tsim khoom, ib feem tuaj yeem tsim khoom nrog tus nqi qis thiab ua haujlwm, thiab nws yooj yim rau sib sau ua ke.
Nws yog qhov tsim nyog los txiav txim siab txhua yam ntawm kev tsim khoom, cov khoom siv, kev tsim khoom dawb, txheej txheem txheej txheem, txheej txheem sib dhos, siv cov tseev kom muaj thiab lwm yam, thiab tsim qauv ntawm ib feem tsim nyog.