Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
doanh cua » doanh luan
dong cong » duong cong, dung cong, dang cong
doc hieu » toc thieu, hoc thieu
cua dong » chua dong, cua cong, cua dang
cong tan » cong tac, cong san, cong thanh
tan hanh » tan thanh, tang hanh, toan hanh
hanh ca » hanh cac, hanh cat, hanh cua

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) or (hoc hien)) manh - doanh doanh cua dong cong tan hanh ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc hien)) manh - doanh doanh cua dong cong tan hanh ca*.