Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
tieu sach » dien sach, te sach, viet sach
hanh tran » hanh trang, thanh tran, hanh tram
dung cong » dung trong
tran van » luan van
van dung » van dong, xay dung, tin dung
tan toan » tan tran, tap toan, van toan

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: theo ((tieu sach) OR (chieu sach)) - hanh tran van dung cong ((tan toan) OR (von tai)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((tieu sach) OR (chieu sach)) - hanh tran van dung cong ((tan toan) or (von tai)) cau~".
• Adding a wildcard symbol may retrieve word variants: theo ((tieu sach) OR (chieu sach)) - hanh tran van dung cong ((tan toan) or (von tai)) cau*.