Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
hieu ve » hieu va, hieu van
hanh di » hanh vi, hanh de, hang di
cuu tre » cua tre, cau tren, cau treo
sach v » sach va, sach 2, sach vay
nang o » nang co, nang ho, nang ro
di cuu » di cau, di cua, dinh cuu
o hoi » co hoi, o hoc, o hai
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 v) or (sach y)) nang o hoi. hieu ve am thuc vat hanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach v) OR (sach y)) nang o hoi. hieu ve am thuc vat hanh di cuu tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach v) or (sach y)) nang o hoi. hieu ve am thuc vat hanh di cuu tre*.