Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
mang xa » mang may, dang xay, mang cua
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, luc va, xac 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: su sach thue ((mang xa) OR (lang xa)) hoi. hieu vien cac ((xuc va) or (tuc va)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thue ((mang xa) OR (lang xa)) hoi. hieu vien cac ((xuc va) OR (tuc va)) hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thue ((mang xa) OR (lang xa)) hoi. hieu vien cac ((xuc va) or (tuc va)) hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach thue ((mang xa) OR (lang xa)) hoi. hieu vien cac ((xuc va) or (tuc va)) hanh vai cua tre*.