Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
hanh mang » nhanh mang, hanh trang, nhanh lang
chua dong » cua dong, ha dong, huy dong
doc hieu » toc thieu, hoc thieu, hoc hien
cua nong » cua cong, cuu nong, cua dong
cong dan » cong san, cong tan, huong dan
chan ban » can ban, chat ban, chan doan
chan nan » chan nhan, chang nang, chan doan

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: doc hieu xanh - hanh mang ((cua nong) OR (chua dong)) cong dan ((chan ban) OR (chan nan))~.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh mang ((cua nong) or (chua dong)) cong dan ((chan ban) or (chan nan))*.