Nws muaj cov haujlwm ntawm kev hloov pauv hloov ceev ceev, siv lub rooj siv tsis zoo, ua kom muaj kev tiv thaiv lub qhov rooj, thiab cov khoom siv kub, txhim khu kev qha cov nyhuv cuam tshuam. Lub tshuab yog ntsia rau hauv ib qho kev ua haujlwm tseem ceeb kom paub cov kev ua haujlwm yooj yim thiab txhim khu kev qha sib khi. Nws yog cov khoom lag luam zoo los hloov cov khoom lag luam txawv teb, cov haujlwm tsis zoo, kev tiv thaiv hluav taws xob, kev tiv thaiv ib puag ncig thiab zoo nkauj.