Perhaps you should try some spelling variations:
sach tin » sach tien, sach kinh, sach tren
tin mang » tin nang, ninh mang, tien manh
van hanh » van thanh, ban hanh, van ban
te sach » toc sach
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
van anh » van thanh, tuan anh, van minh
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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 cac tuc ((van hanh) OR (van anh)) vi cua tu~.
• Adding a wildcard symbol may retrieve word variants: te sach tin mang xa hoi. hieu va cac tuc ((van hanh) or (van anh)) vi cua tu*.