Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
sach ky » sac ky, sach y, sach ty
va danh » va dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh
co viet » so viet, o viet, hoc viet
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 (co 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 (co 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 (co viet))*.