Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
hanh vai » hanh tai, hanh van, hanh voi
vien cac » vien bach, vien dai, vien da
te sach » toc sach
hanh va » hang va
cua tre » cua te, cuu tre, cua triet
sach lo » sach dao, sach doi, sach hoi
cac tuc » cac toc, cac tu, cac tac
nang xa » nang x, lang xa, nang ma
lo nang » ho nang, ly nang, loai nang
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 nang xa hoi. hieu vien cac tuc va ((((hanh vai) OR (hanh vi))) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach lo nang xa hoi. hieu vien cac tuc va ((((hanh vai) OR (hanh vi))) OR (hanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach lo nang xa hoi. hieu vien cac tuc va ((((hanh vai) OR (hanh vi))) or (hanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach lo nang xa hoi. hieu vien cac tuc va ((((hanh vai) OR (hanh vi))) or (hanh va)) cua tre*.