Cov yam ntxwv ntawm daim ntawv no:

1. Cov hmoov molding pov tseg (lub thawv tuaj yeem siv tau)

2. Cia li rub tawm cov khoom tom qab nias

3. Kev ua haujlwm siab ntau lawm.

4. Cov khoom tsim tawm: lub nruas nres, lub tsheb kauj vab nres, tsheb ciav hlau nres