Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
va danh » va dinh, va hanh, dia danh
va dan » ca dan, va dao, va dau
x hoi » xa hoi, o hoi, x ho
ve am » va am

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: tu sach ky nang x hoi. hieu ve am thuc ((va danh) OR (va dan)) dai ((cua triet) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu ve am thuc ((va danh) OR (va dan)) dai ((cua triet) or (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ve am thuc ((va danh) OR (va dan)) dai ((cua triet) or (cua viet))*.