Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
van cac » van hac, van cau, van bac
cac hoc » cach hoc, cac hop, bac hoc
va hanh » van hanh, va thanh, va danh
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: toc ((sach ky) OR (sach y)) ((nang x) OR (lang xa)) hoi. hieu van cac hoc va hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) or (sach y)) ((nang x) or (lang xa)) hoi. hieu van cac hoc va hanh vi cua tre*.