Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
doanh cua » doanh luan
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan dau » phan tu, hang dau
ban cua » ban quan

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