Perhaps you should try some spelling variations:
dinh vai » dinh van, dinh vi, dinh va
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cac toc » cac toi, cac nuoc, cac thoi
va dinh » van dinh, va kinh, va tinh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
toc va » hoc va, toc ta, tuc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky ((van xay) or (lang xa)) hoi. hieu ve cac toc va dinh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((van xay) OR (lang xa)) hoi. hieu ve cac toc va dinh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky ((van xay) or (lang xa)) hoi. hieu ve cac toc va dinh vai cua tre*.