tsim cov tswv yim thiab cov duab kos hauv cov lus

Cov khoos kas zoo tshaj plaws los tsim cov kev npaj siab thiab cov phiaj xwm [DAWB].

Peb paub ua ntej li cas daim ntawv qhia kev siv tswv yim yog vim lawv txoj haujlwm zoo rau kev kawm, khaws cia thiab cim cia ...