Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hien cac » thien cac, vien cac, hieu cac
dinh vai » dinh vi, dinh va, dinh tai
dinh van » sinh vat
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
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 lang xa hoi. hieu hien cac lo va ((dinh vai) or (dinh van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu hien cac lo va ((dinh vai) OR (dinh van)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu hien cac lo va ((dinh vai) or (dinh van)) cua tre*.