Ntim sau los ntawm tag nrho cov khoom lag luam sib txuas los ntawm cov khoom siv raw, kev yuav khoom, kev tsim khoom, muag thiab siv, thiab cuam tshuam nrog tib neeg lub neej. Nrog kev siv tas li ntawm txoj cai tiv thaiv ib puag ncig thiab kev txhim kho ntawm cov neeg siv khoom 'kev tiv thaiv ib puag ncig lub hom phiaj, kev xaiv tsa ...
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