Perhaps you should try some spelling variations:
vien cao » vien dai, vien da, vien va
vien cac » vien bach, vien dai, vien da
tan hanh » tan thanh, tang hanh, toan hanh
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
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 ty lang xa hoi. hieu ((vien cao) OR (vien cac)) duc tan hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty lang xa hoi. hieu ((vien cao) OR (vien cac)) duc tan hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty lang xa hoi. hieu ((vien cao) OR (vien cac)) duc tan hanh vi cua tre*.