Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
chieu tach » chiet tach, chieu sach, chiu trach
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
hanh tung » thanh tung, manh tung, hanh dung
cua nhung » va nhung
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai 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 chieu tach - ((hanh tung) or (hanh trang)) cua nhung cong ((tan toan) OR (tap toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu tach - ((hanh tung) OR (hanh trang)) cua nhung cong ((tan toan) OR (tap toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu tach - ((hanh tung) or (hanh trang)) cua nhung cong ((tan toan) OR (tap toan)) cau".
• Adding a wildcard symbol may retrieve word variants: doi chieu tach - ((hanh tung) or (hanh trang)) cua nhung cong ((tan toan) OR (tap toan)) cau*.