Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
sach thue » sach thu, sach thieu, sach tham
hanh vai » hanh vi, hanh va, hanh tai
dang tay » dang xay, dung tay, dan tay
vien da » vien dai, hien dai
vai cua » dai cua, hai cua, lai cua
sach ty » sach y, sach tu, sach thu
tay hoi » tay ho, tao hoi, tay thai
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 ty) or (sach thue)) dang tay hoi. hieu vien da ((xuc va) or (tuc va)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thue)) dang tay hoi. hieu vien da ((xuc va) OR (tuc va)) hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach thue)) dang tay hoi. hieu vien da ((xuc va) or (tuc va)) hanh vai cua tre*.