Perhaps you should try some spelling variations:
hieu cua » hieu qua, dieu cua, bieu cua
toc sach » hoc sach, doc sach, thuoc sach
cua bach » cua bac, cua banh, cua khach
hai cua » thai cua, dai cua, hoi cua
anh hai » lanh hai, manh hai, anh thai
mang xa » lang xa, mang may, dang xay
ty mang » ty xang, ty hang, tin mang
cua te » cua tu

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: ((te sach) OR (toc sach)) ty mang xa hoi. hieu cua bach ((tu van) OR (tu va)) anh hai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ty mang xa hoi. hieu cua bach ((tu van) OR (tu va)) anh hai cua te~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty mang xa hoi. hieu cua bach ((tu van) OR (tu va)) anh hai cua te*.