Perhaps you should try some spelling variations:
sach tin » sach tien, sach kinh, sach tren
tin mang » tin nang, ninh mang, tien manh
dan hang » van hang, dat hang, dai hang
ban hang » ngan hang
te sach » toc sach
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu
va am » va lam, va cam

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 tin mang xa hoi. hieu va am thuc ((dan hang) OR (ban hang)) di ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tin mang xa hoi. hieu va am thuc ((dan hang) OR (ban hang)) di ((cua tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: te sach tin mang xa hoi. hieu va am thuc ((dan hang) OR (ban hang)) di ((cua tre) or (cua te))*.