Fiber ntau cov yam ntxwv
(1) Cov kis poob qis yog me me thiab qhov sib txawv ntawm qhov ntev yog ntev, uas tshwj xeeb tshaj yog kev lag luam rau kev xa mus ntev;
(2) Zoo tiv thaiv xob laim thiab hluav taws xob cuam tshuam kev ua haujlwm. Qhov no yog qhov tseem ceeb heev nyob rau hauv ib puag ncig muaj kev cuam tshuam siab tam sim no mem tes;
(3) Me loj thiab lub teeb yuag. Qhov no yog qhov tshwj xeeb tshwj xeeb yog thaum txoj hlua hluav taws xob zaws uas twb muaj lawm twb tau txiav txim siab.