Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
hanh lai » hanh lam, hanh tai, thanh lap
vien cac » vien bach, vien dai, vien da
thuc va » thuc vat, thuc dan, thuc day
lai cua » dai cua, hai cua, lai chau
sach ty » sach tu, sach thu, xach tay
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
ang xa » lang xa, mang xa, dang xay

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 y)) ang xa hoi. hieu vien cac ((xuc va) or (thuc va)) hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) ang xa hoi. hieu vien cac ((xuc va) OR (thuc va)) hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach y)) ang xa hoi. hieu vien cac ((xuc va) or (thuc va)) hanh lai cua tre*.