Lub POS ua haujlwm li cas?
POS lossis POP kev ua haujlwm los ntawm kev kos duab rau ib yam khoom tshiab, kev txhawb nqa los ntawm kev ua haujlwm lossis kev txhawb tshwj xeeb uas tau nthuav tawm siv ntau yam ntsiab lus muag khoom tsim qauv zoo li cov chaw muag khoom zaub muag zaub dawb, PDQ lossis txawm tias cov hnub qub tas mus li.
Los ntawm kev tsim tej yam txawv rau lub khw muag khoom muag chaw nyob tam sim ntawd koj tsim kom muaj kev cuam tshuam rau thaj chaw rau koj hom thiab cov khoom lag luam uas muaj qhov zoo dua ua kom hloov mus rau hauv cov neeg yuav khoom mus rau cov neeg yuav khoom los ntawm kev kos lawv cov xim.
