Perhaps you should try some spelling variations:
cua viet » hoa viet, cua vat, cua dieu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
va hanh » van hanh, va thanh, va danh
ca viet » va viet, co viet, hoa viet
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu ((van nam) or (van cau)) duc va hanh kem ((cua viet) OR (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ((van nam) OR (van cau)) duc va hanh kem ((cua viet) OR (ca viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu ((van nam) or (van cau)) duc va hanh kem ((cua viet) OR (ca viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ((van nam) or (van cau)) duc va hanh kem ((cua viet) OR (ca viet))*.