Semi- cov khoom ntim tsis siv neeg: Yuav tsum tau muaj kev cuam tshuam los ntawm phau ntawv hauv qee cov txheej txheem ntim khoom, xws li pub mis thiab tshem tawm. Haum rau cov lag luam me me - nplai nrog ntau yam khoom.
Cov khoom ntim tsis siv neeg puv puv: Ua kom muaj kev ua haujlwm puv ntoob ntawm tag nrho cov txheej txheem ntim khoom yam tsis muaj kev cuam tshuam los ntawm phau ntawv. Haum rau cov lag luam loj dua - nplai nrog ib hom khoom lag luam, txhim kho kev tsim khoom thiab cov khoom zoo.