Perhaps you should try some spelling variations:
sach nang » cach mang, sach dung, sach danh
cua viet » ca viet, hoa viet, cua vat
cau thuc » cau truc, cuu thuc, can thuc
sach han » sach tham, sach danh, sach dao
kem cua » em cua, keo cua, diem cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
va cau » van cau, va cac, va dau
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 han) OR (sach nang)) nang ((ma hoi) OR (ma hoa)). hieu va cau thuc va hanh kem cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach han) or (sach nang)) nang ((ma hoi) OR (ma hoa)). hieu va cau thuc va hanh kem cua viet~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach han) or (sach nang)) nang ((ma hoi) OR (ma hoa)). hieu va cau thuc va hanh kem cua viet*.