Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
cong cong » trong cong, dung cong, dang cong
ho chieu » theo chieu, hoc thieu, doi chieu
bai toan » bai tap
van tuan » van quan, van ban, anh tuan

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: ho chieu xanh - hanh tranh cua ((cong cong) OR (cong dong)) ((bai toan) OR (van tuan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu xanh - hanh tranh cua ((cong cong) OR (cong dong)) ((bai toan) or (van tuan)) cau~".
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - hanh tranh cua ((cong cong) OR (cong dong)) ((bai toan) or (van tuan)) cau*.