Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu hien » bieu hien, dieu hien, chieu chien
te sach » toc sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. ((thieu nien) or (hieu hien)) cac du ((va hanh) or (va tinh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. ((thieu nien) OR (hieu hien)) cac du ((va hanh) OR (va tinh)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. ((thieu nien) or (hieu hien)) cac du ((va hanh) or (va tinh)) dai cua tre*.