Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trinh » canh tranh, hanh chinh
thong cong » tong cong, thong thong, phong chong
hoc chieu » hoc thieu, ho chieu, hoc hien
trinh cua » tinh cua, trinh luat, trinh quan
manh toan » thanh toan, anh tuan, tinh toan
dan than » dan chan, ban than, van than

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 trinh cua ((thong cong) OR (trong cong)) ((dan than) OR (manh toan)) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu xanh - hanh trinh cua ((thong cong) OR (trong cong)) ((dan than) or (manh toan)) ban~".
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - hanh trinh cua ((thong cong) OR (trong cong)) ((dan than) or (manh toan)) ban*.