Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, hang cong
tranh cua » doanh cua, manh cua
tong cong » trong cong, cong cong, dung cong
ho chiet » ho chieu, ho thiet, hoc thiet
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: ho chiet tach - hanh tranh cua ((nhung cong) or (tong cong)) ((tan toan) or (tap toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - hanh tranh cua ((nhung cong) OR (tong cong)) ((tan toan) OR (tap toan)) cau.
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - hanh tranh cua ((nhung cong) or (tong cong)) ((tan toan) or (tap toan)) cau*.