Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh tranh » canh tranh, hanh trinh, hanh trang
hien xanh » hien hanh, hien nhanh, hien khanh
tranh va » tranh van, trang va, trinh va
cong dan » cong san, cong tan, huong dan
cong tac » cong ty
than tu » thanh tu, thang tu, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien xanh) or (chieu xanh)) - hanh tranh va nhung ((cong dan) or (cong tac)) than tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (chieu xanh)) - hanh tranh va nhung ((cong dan) OR (cong tac)) than tu.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (chieu xanh)) - hanh tranh va nhung ((cong dan) or (cong tac)) than tu*.