Perhaps you should try some spelling variations:
vien cao » vien cac, vien dai, vien da
tan hanh » tan thanh, tang hanh, toan hanh
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu lang » cu lang, tu lanh, xu lang
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 lang xa hoi. hieu ((vien cao) or (vien bach)) duc tan hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu lang xa hoi. hieu ((vien cao) OR (vien bach)) duc tan hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach tu lang xa hoi. hieu ((vien cao) or (vien bach)) duc tan hanh vi cua tre*.