Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
nam thuc » nam thuoc, am thuc, nam thu
te sach » toc sach
dai cuu » dai cua, dai huu
sach tu » sach thu, cach tu, sach ty
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
mang xa » mang may, dang xay, mang cua
cam tu » cam thu, nam tu, dam tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach tu ((mang xa) or (lang xa)) hoi. hieu ve ((nam thuc) or (cam tu)) van hanh dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu ((mang xa) OR (lang xa)) hoi. hieu ve ((nam thuc) OR (cam tu)) van hanh dai cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sach tu ((mang xa) or (lang xa)) hoi. hieu ve ((nam thuc) or (cam tu)) van hanh dai cuu tre*.