Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
hanh vai » hanh vi, hanh va, hanh tai
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty dang » ty xang, ky dang, ty hang
dang xa » dang xay, lang xa, dang ha
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
luc va » loc va
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 ty dang xa hoi. hieu vien cac ((((luc va) or (duc va))) or (tuc va)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty dang xa hoi. hieu vien cac ((((luc va) OR (duc va))) OR (tuc va)) hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty dang xa hoi. hieu vien cac ((((luc va) or (duc va))) or (tuc va)) hanh vai cua tre*.