Perhaps you should try some spelling variations:
sach van » sach han, sach va, bach van
van hanh » van thanh, ban hanh, van anh
cau thuc » cuu thuc, can thuc, cau phuc
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
hanh de » hanh ve, hanh kem
cuu tre » cau tren, cau treo
hieu ve » hieu va, hieu van
x hoi » xa hoi, o hoi, x ho
ban x » ban xu, ban _, ban 1

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach van ban x hoi. hieu ve ((cau thuc) or (cau truc)) van hanh de ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach van ban x hoi. hieu ve ((cau thuc) OR (cau truc)) van hanh de ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach van ban x hoi. hieu ve ((cau thuc) or (cau truc)) van hanh de ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su sach van ban x hoi. hieu ve ((cau thuc) or (cau truc)) van hanh de ((cua tre) OR (cuu tre))*.