Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
dinh di » dinh du, danh di, dich di
dinh vi » dinh ve, dinh viet, dinh tri
cua tre » cua te, cuu tre, cua triet

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: ((thu sach) OR (tu sach)) ky lang xa hoi. hieu ve pham duc va ((dinh di) OR (dinh vi)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (tu sach)) ky lang xa hoi. hieu ve pham duc va ((dinh di) OR (dinh vi)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) ky lang xa hoi. hieu ve pham duc va ((dinh di) OR (dinh vi)) cua tre*.