Tsim los ua ib feem tseem ceeb ntawm qhov chaw hla kev cob qhia, kev cia txaus thiab kav ntev yog qhov tseem ceeb. Ob-theem muaj peev xwm khaws cia tau yooj yim rau kev nkag mus tau yooj yim raws li kev xav tau ntawm gym nce. Ua tsaug rau DHZ cov khoom siv muaj zog thiab kev tsim khoom, cov qauv ntawm cov cuab yeej siv tau ruaj khov thiab muaj tsib xyoos lav.