Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hien xanh » hien hanh, hien nhanh, hien khanh
hanh hang » thanh hang, hang hang, hanh han
hay khong » bay khong, hang khong, hoac khong
ha khong » hoa khong, hua khong, he khong
cang tan » cong tan, cung tan, tang tan
tan toan » tan tran, tap toan, van 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 ((hien xanh) OR (chieu xanh)) - hanh hang ((ha khong) OR (hay khong)) cang tan toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (chieu xanh)) - hanh hang ((ha khong) OR (hay khong)) cang tan toan ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (chieu xanh)) - hanh hang ((ha khong) OR (hay khong)) cang tan toan ban*.