Perhaps you should try some spelling variations:
chiet tach » chieu sach
tinh trang » minh trang, tinh quang, tinh toan
nhung cong » dung cong, thong cong, hang cong
doi chiet » doi chieu, doi chi, doi viet
cua nhung » va nhung
san toan » van toan, manh toan, xuan toan
dan toan » van toan, dan than, manh toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chiet tach - ((tinh trang) or (canh tranh)) cua nhung cong ((san toan) OR (dan toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chiet tach - ((tinh trang) OR (canh tranh)) cua nhung cong ((san toan) OR (dan toan)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chiet tach - ((tinh trang) or (canh tranh)) cua nhung cong ((san toan) OR (dan toan)) cau*".