Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cua viet » hoa viet, cua vat, cua dieu
hieu van » hieu va, thien van, lieu va
va dinh » van dinh, va kinh, va tinh
ca viet » va viet, co viet, hoa viet
sach ky » sac ky, sach y, sach ty
va danh » va dan, va hanh, dia danh
van am » van nam, van lam, van dam
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: thu sach ky nang x hoi. hieu van am thuc ((va danh) or (va dinh)) vai ((cua viet) OR (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu van am thuc ((va danh) OR (va dinh)) vai ((cua viet) OR (ca viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu van am thuc ((va danh) or (va dinh)) vai ((cua viet) OR (ca viet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu van am thuc ((va danh) or (va dinh)) vai ((cua viet) OR (ca viet))*.