Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh manh » hanh mang, lanh manh, hoang manh
doc hieu » toc thieu, hoc thieu, hoc hien
cua dong » chua dong, cua cong, cua dang
qua dung » quang dung, su dung, qua song
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than man » than ma, thanh san, tran manh

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu manh - hanh manh ((cua dong) or (qua dung)) cong dan than man~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - hanh manh ((cua dong) OR (qua dung)) cong dan than man.
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - hanh manh ((cua dong) or (qua dung)) cong dan than man*.