Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
sach thu » sach thue, sach thieu, sach tham
dang xay » dang van, van xay
hanh ca » hanh cac, hanh cat, hanh cua
truc va » thuc va, thuc vat, trung va
vien da » vien dai, hien dai
sach ty » sach y, sach tu, xach tay
xay hoi » xa hoi, tay hoi, cay phoi
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, tuc xa, duc va
ca cua » co cua

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 thu)) dang xay hoi. hieu vien da ((tuc va) or (truc va)) hanh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thu)) dang xay hoi. hieu vien da ((tuc va) OR (truc va)) hanh ca cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach thu)) dang xay hoi. hieu vien da ((tuc va) or (truc va)) hanh ca cua tre*.