Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, dieu hanh, hien hanh
cong tan » cong tac, cong san, cong thanh
tan gian » tran gian, dan gian, van gian
gian cau » gian chau, gian cac, gian cam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) OR (hieu nganh)) - hanh ((doanh tai) or (doanh nhan)) nhung cong tan gian cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu nganh)) - hanh ((doanh tai) OR (doanh nhan)) nhung cong tan gian cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) OR (hieu nganh)) - hanh ((doanh tai) or (doanh nhan)) nhung cong tan gian cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) OR (hieu nganh)) - hanh ((doanh tai) or (doanh nhan)) nhung cong tan gian cau*.