Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
canh danh » anh danh, canh dan, canh tranh
dung cong » dung trong
dan thanh » dang thanh, danh thanh, ban thanh
doc hieu » toc thieu, hoc thieu, hoc hien
danh qua » hanh qua, doanh quan, manh quan
qua dung » quang dung, su dung, qua song
dan hanh » dang hanh, dan khanh, ban hanh

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 - canh danh qua dung cong ((dan hanh) or (dan thanh)) cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - canh danh qua dung cong ((dan hanh) OR (dan thanh)) cac*.