Perhaps you should try some spelling variations:
cua viet » hoa viet, cua vat, cua dieu
ca viet » va viet, co viet, hoa viet
tinh vi » trinh vi, tinh voi, tinh va
loc may » hoc may, loc mau, loai may
cac loc » cac lop, cac toc, cac hoc
hieu ve » hieu va, hieu van
lang xa » dang xay, lang van
lang ha » long ha
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
so sac » so sach, so dac

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) OR (lang ha)) hoi. hieu ve cac loc may tinh vi ((cua viet) OR (ca viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky ((lang xa) OR (lang ha)) hoi. hieu ve cac loc may tinh vi ((cua viet) or (ca viet))~".
• Adding a wildcard symbol may retrieve word variants: so sac ky ((lang xa) OR (lang ha)) hoi. hieu ve cac loc may tinh vi ((cua viet) or (ca viet))*.