Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
tang van » dang van, hoang van, trong van
vien cac » vien bach, vien dai, vien da
te sach » toc sach
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
van hoi » van hoa, van hoc, van hoe
ky tang » ky nang, ky dang, kho tang
tuc va » truc va, tuc xa, duc va
vi cua » vai cua, di cua
xuc va » duc va, luc va, xac va

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

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