Perhaps you should try some spelling variations:
cua triet » su triet, va triet
va doanh » van doanh, vay doanh, hoa doanh
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
va am » va lam, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang cao hoi. hieu va am thuc ((va doanh) OR (va danh)) van ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cao hoi. hieu va am thuc ((va doanh) OR (va danh)) van ((cua triet) OR (cua viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang cao hoi. hieu va am thuc ((va doanh) OR (va danh)) van ((cua triet) or (cua viet))*".