Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
dinh vai » dinh van, dinh vi, dinh va
hien cac » thien cac, vien cac, hieu cac
sach ky » sac ky, sach y, sach ty
vai cua » dai cua, hai cua, lai cua
va dinh » van dinh, va kinh, va tinh
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
mang xa » mang may, dang xay, mang cua
nang xa » nang x, nang ma, ang xa
cua tre » cua te, cuu tre, cua triet
cac lo » cac lop, cac co, cac bo
lo va » lo van, lao va, ly va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((((nang xa) OR (mang xa))) or (lang xa)) hoi. hieu hien cac lo va dinh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((((nang xa) OR (mang xa))) OR (lang xa)) hoi. hieu hien cac lo va dinh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((((nang xa) OR (mang xa))) or (lang xa)) hoi. hieu hien cac lo va dinh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((((nang xa) OR (mang xa))) or (lang xa)) hoi. hieu hien cac lo va dinh vai cua tre*.