Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh tung » thanh tung, manh tung, hanh dung
bang cong » dang cong, bang song, hang cong
doc hieu » toc thieu, hoc thieu, hoc hien
anh tang » anh bang, anh dang, anh nang
cua bang » chua bang, cua ban, cua dang
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap

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 tung) or (anh tang)) cua bang cong tan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - ((hanh tung) OR (anh tang)) cua bang cong tan than cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - ((hanh tung) or (anh tang)) cua bang cong tan than cau*.