Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
hanh vai » hanh vi, hanh tai, hanh van
dang xay » dang van, van xay
te sach » toc sach
hanh va » hang va, hanh vi
sach lo » sach dao, sach doi, sach hoi
vien da » vien dai, hien dai
lang xa » lang ha, lang van
cua tre » cua te, cuu tre, cua triet
da tuc » dao tuc, va tuc, da tac
tuc va » thuc va, truc va, tuc xa

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 lo ((lang xa) OR (dang xay)) hoi. hieu vien da tuc va ((hanh vai) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach lo ((lang xa) OR (dang xay)) hoi. hieu vien da tuc va ((hanh vai) OR (hanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach lo ((lang xa) OR (dang xay)) hoi. hieu vien da tuc va ((hanh vai) or (hanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach lo ((lang xa) OR (dang xay)) hoi. hieu vien da tuc va ((hanh vai) or (hanh va)) cua tre*.