Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
hanh tranh » canh tranh, hanh trinh, lanh tranh
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, nhung don
hang cong » dang cong, hang nong, bang cong
doc hieu » toc thieu, hoc thieu, hoc hien
dan than » dan chan, ban than, van 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 nganh - ((hanh tranh) OR (hanh trang)) cua ((nhung cong) or (hang cong)) dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu nganh - ((hanh tranh) OR (hanh trang)) cua ((nhung cong) OR (hang cong)) dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu nganh - ((hanh tranh) OR (hanh trang)) cua ((nhung cong) or (hang cong)) dan than cau".
• Adding a wildcard symbol may retrieve word variants: doc hieu nganh - ((hanh tranh) OR (hanh trang)) cua ((nhung cong) or (hang cong)) dan than cau*.