Perhaps you should try some spelling variations:
hang tai » hang va, dung tai
va triet » va thiet, ve triet, cua triet
va trien » va truyen, va thiet, va tuyen
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cac hoc » cach hoc, cac hop, bac hoc
va hang » van hang, va nang, va lang
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky lang xa hoi. hieu va cac hoc va hang tai ((va triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky lang xa hoi. hieu va cac hoc va hang tai ((va triet) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: su xac ky lang xa hoi. hieu va cac hoc va hang tai ((va triet) or (va trien))*.