Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
lang van » dang van, tang van, hoang van
vien cac » vien bach, vien dai, vien da
hoc sach » hoc sinh, hoc anh
van hoi » van hoa, van hoc, van hoe
hoc cac » hoc cao
tuc van » thuc van, truc van, duc van
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) or (hoc cac)) y lang van hoi. hieu vien cac ((tuc van) or (tuc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc cac)) y lang van hoi. hieu vien cac ((tuc van) OR (tuc va)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (hoc cac)) y lang van hoi. hieu vien cac ((tuc van) or (tuc va)) hanh vi cua tre*.