Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
cau treo » cau theo, cau tren, cau triet
sach va » sach xa, sach ha, sach dao
hieu ve » hieu va, hieu van
hanh di » hanh vi, hanh de, hang di
di cau » da cau, diem cau
x hoi » xa hoi, o hoi, 5 hoi
ve am » va am
thuc » thu

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 va) or (sach y)) nang ((x hoi) or (x ho)). hieu ve am thuc vat hanh di cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach va) OR (sach y)) nang ((x hoi) OR (x ho)). hieu ve am thuc vat hanh di cau treo.
• Adding a wildcard symbol may retrieve word variants: su ((sach va) or (sach y)) nang ((x hoi) or (x ho)). hieu ve am thuc vat hanh di cau treo*.