Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
va viet » hoa viet, san viet, mai viet
tinh vi » trinh vi, tinh voi, tinh va
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cac loc » cac lop, cac hoc, cac nuoc
cac toc » cac toi, cac nuoc, cac thoi
so sac » so sach, so dac
sac ky » cac ky, sai ky

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky lang xa hoi. hieu ve ((cac loc) OR (cac toc)) may tinh vi ((cua viet) OR (va viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky lang xa hoi. hieu ve ((cac loc) OR (cac toc)) may tinh vi ((cua viet) or (va viet))~".
• Adding a wildcard symbol may retrieve word variants: so sac ky lang xa hoi. hieu ve ((cac loc) OR (cac toc)) may tinh vi ((cua viet) or (va viet))*.