Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, hang cong
dang cong » dung cong
ho chieu » theo chieu, hoc thieu, doi chieu
tranh va » tranh van, trang va, trinh va
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 chieu xanh - hanh tranh va ((nhung cong) or (dang cong)) ((tan toan) OR (tap toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu xanh - hanh tranh va ((nhung cong) OR (dang cong)) ((tan toan) OR (tap toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu xanh - hanh tranh va ((nhung cong) or (dang cong)) ((tan toan) OR (tap toan)) cau".
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - hanh tranh va ((nhung cong) or (dang cong)) ((tan toan) OR (tap toan)) cau*.