Perhaps you should try some spelling variations:
nham nang » phap nang, cam nang, kha nang
sach nham » sach nha, sach tham, sach han
cau thuc » cau truc, cuu thuc, can thuc
cua viet » hoa viet, cua vat, cua dieu
banh kem » hanh kem, banh keo, ban kem
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
va banh » va ban, va danh, va hanh
van cau » van dau, van hau, van chat
thuc va » thuc vat, thuc dan, thuc day
ca viet » va viet, co viet, hoa viet
ma hoi » mai hoi, xa hoi, me hoi

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: tu sach nham nang ((ma hoi) OR (ma hoa)). hieu van cau thuc va banh kem ((cua viet) OR (ca viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach nham nang ((ma hoi) or (ma hoa)). hieu van cau thuc va banh kem ((cua viet) OR (ca viet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach nham nang ((ma hoi) or (ma hoa)). hieu van cau thuc va banh kem ((cua viet) OR (ca viet))*.