Perhaps you should try some spelling variations:
cua viet » hoa viet, cua vat, cua dieu
trinh vi » trinh va, trinh ve, trinh viet
ca viet » va viet, co viet, hoa viet
loc may » hoc may, loc mau, loai may
tinh vi » tinh voi, tinh va, dinh vi
cac loc » cac lop, cac toc, cac hoc
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
ve cac » va cac, vien cac
sac ky » cac ky, sai ky
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 dang xa hoi. hieu ve cac loc may ((tinh vi) OR (trinh vi)) ((cua viet) OR (ca viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky dang xa hoi. hieu ve cac loc may ((tinh vi) OR (trinh vi)) ((cua viet) or (ca viet))~".
• Adding a wildcard symbol may retrieve word variants: so sac ky dang xa hoi. hieu ve cac loc may ((tinh vi) OR (trinh vi)) ((cua viet) or (ca viet))*.