Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu nganh » vien nganh, hiem ngan, nghiep nganh
hieu manh » chieu xanh, dieu hanh, hien hanh
dang luan » dung luan, tang luan, hang luan
hung cong » hung cuong, phung cong, dung cong
anh dang » anh dong, anh dung, anh bang
san than » sang than, san thanh, 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) or (hieu nganh)) - anh dang luan ((hung cong) OR (nhung cong)) san than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (hieu nganh)) - anh dang luan ((hung cong) OR (nhung cong)) san than cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu manh) or (hieu nganh)) - anh dang luan ((hung cong) OR (nhung cong)) san than cau*".