Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh manh » hanh mang, hoang manh, thanh minh
lanh manh » lanh tranh, lan anh, van manh
doc hieu » toc thieu, hoc thieu, hoc hien
cua dung » cua dang, cua dong, qua dung
cong san » cong tac
san van » tan van, luan van, tran van

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) or (lanh manh)) ((cua dung) or (qua song)) cong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - ((hanh manh) OR (lanh manh)) ((cua dung) OR (qua song)) cong san van ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - ((hanh manh) or (lanh manh)) ((cua dung) or (qua song)) cong san van ban*.