Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hoc chieu » hoc thieu, ho chieu, hoc hien
hanh tang » hanh trang, anh tang, hanh mang
bang cong » bang song, hang cong, dung cong
dang cong » dung cong
manh toan » thanh toan, anh tuan, tinh toan
toan ban » van ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu xanh - ((hanh tang) OR (canh tranh)) cua ((bang cong) OR (dang cong)) manh toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu xanh - ((hanh tang) or (canh tranh)) cua ((bang cong) OR (dang cong)) manh toan ban~".
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - ((hanh tang) or (canh tranh)) cua ((bang cong) OR (dang cong)) manh toan ban*.