Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
so sanh » do sanh
lang xa » lang ha, dang xay, lang van
van cac » van hac, van cau, van bac
cac tuc » cac toc, cac tu, cac tac
xa hanh » xa thanh, xa khanh, va hanh
cua tre » cua te, cuu tre, cua triet
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: ((su sach) OR (so sanh)) va ((nang x) OR (lang xa)) hoi. hieu van cac tuc xa hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) va ((nang x) or (lang xa)) hoi. hieu van cac tuc xa hanh vi cua tre*.