Perhaps you should try some spelling variations:
tieu sach » chieu sach, dien sach, te 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, dan toan
van toan » van tuan, van tan, van thanh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - hanh tran van dung cong ((((tan toan) OR (van toan))) or (von tai)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - hanh tran van dung cong ((((tan toan) OR (van toan))) OR (von tai)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - hanh tran van dung cong ((((tan toan) OR (van toan))) or (von tai)) cau*".