Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va hanh, dia danh
so sanh » do sanh
sanh va » hanh va, anh va, sinh va
lai roi » lai hoi, loi roi
mai doi » moi doi, mai hoi, mai khoi
va nang » van nang, da nang, cam nang
van cam » van nam, van lam, van cau
va dan » ca dan, va dao, va dau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh va nang ((mai doi) OR (lai roi)). hieu van cam thuc ((va danh) OR (va dan)) vai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh va nang ((mai doi) or (lai roi)). hieu van cam thuc ((va danh) OR (va dan)) vai cua viet~".
• Adding a wildcard symbol may retrieve word variants: so sanh va nang ((mai doi) or (lai roi)). hieu van cam thuc ((va danh) OR (va dan)) vai cua viet*.