Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
sach ky » sac ky, sach y, sach kem
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cac toc » cac toi, cac nuoc, cac thoi
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
sach ty » sach y, sach tu, sach thu
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: te ((sach ky) or (sach ty)) ((nang xa) OR (lang xa)) hoi. hieu ve cac toc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach ty)) ((nang xa) OR (lang xa)) hoi. hieu ve cac toc va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach ty)) ((nang xa) OR (lang xa)) hoi. hieu ve cac toc va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach ty)) ((nang xa) OR (lang xa)) hoi. hieu ve cac toc va hanh vai cua tre*.