Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham sac » cham soc, pham sach, cap sac
van hanh » van thanh, ban hanh, van anh
va cham » va chat, va tham
hanh di » hanh vi, hanh de, hang di
sang ky » sang kyo, dang ky, tang ky
dang xa » dang xay, lang xa, dang ha
sac van » cac van, san van, sat van
san ky » van ky, dan ky, ban ky
thiet » thieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((san ky) or (sang ky)) dang xa hoi. lieu va cham sac van hanh di ((cua triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (sang ky)) dang xa hoi. lieu va cham sac van hanh di ((cua triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) or (sang ky)) dang xa hoi. lieu va cham sac van hanh di ((cua triet) or (va thiet))*.