Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
sach thu » sach thue, sach tham, cach thuc
hanh tai » thanh tai, hang tai, han tai
cac xuc » cam xuc, cac nuoc, chat xuc
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach thu) or (sach thieu)) lang xa hoi. hieu vien cac xuc va ((hanh tai) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach thieu)) lang xa hoi. hieu vien cac xuc va ((hanh tai) OR (hanh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) or (sach thieu)) lang xa hoi. hieu vien cac xuc va ((hanh tai) or (hanh vi)) cua tre*.