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
cam tuc » cam xuc, cam tu, dam thuc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
o lang » hoa lang, hoi lang

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 ((_ lang) or (o lang)) xa hoi. hieu ve ((cam tuc) or (nam thuc)) van hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((_ lang) OR (o lang)) xa hoi. hieu ve ((cam tuc) OR (nam thuc)) van hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((_ lang) or (o lang)) xa hoi. hieu ve ((cam tuc) or (nam thuc)) van hanh dai cua tre*.