Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
lai hoi » dai hoi, lai hoa, lai roi
mai doi » moi doi, mai hoi, mai khoi
va danh » va dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh
vai cua » dai cua, hai cua, lai cua
so sach » so sanh, bo sach, co sach
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach v nang ((mai doi) or (lai hoi)). hieu van nam thuc ((va danh) or (va dinh)) vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach v nang ((mai doi) OR (lai hoi)). hieu van nam thuc ((va danh) OR (va dinh)) vai cua viet.
• Adding a wildcard symbol may retrieve word variants: so sach v nang ((mai doi) or (lai hoi)). hieu van nam thuc ((va danh) or (va dinh)) vai cua viet*.