Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
hieu le » hieu ly, tieu le, hieu luc
hieu he » hiem he, hieu hien, hieu kem
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua
na tu » nam tu, nha tu, nao tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang cao hoi. ((hieu le) or (((hieu he) OR (hieu ve)))) na tu va hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang cao hoi. ((hieu le) OR (((hieu he) OR (hieu ve)))) na tu va hanh di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang cao hoi. ((hieu le) or (((hieu he) OR (hieu ve)))) na tu va hanh di cua viet".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang cao hoi. ((hieu le) or (((hieu he) OR (hieu ve)))) na tu va hanh di cua viet*.