Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tang van » dang van, hoang van, trong van
te sach » toc sach
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
toc va » hoc va, tuc va, loc va
toc ta » toc tay, toc thai
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang x) OR (tang van)) hoi. hieu van cac ((toc va) OR (toc ta)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang x) or (tang van)) hoi. hieu van cac ((toc va) OR (toc ta)) hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang x) or (tang van)) hoi. hieu van cac ((toc va) OR (toc ta)) hanh vi cua tre*.