Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, hang cong
tranh cua » doanh cua, manh cua
cua nhung » va nhung
hoc hieu » hoc thieu, hoc hien, doc hieu
dan toan » manh toan, xuan toan, dien toan
van toan » van tuan, van tan, van thanh
dan than » dan chan, ban than, van than

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 nganh - hanh tranh cua nhung cong ((((dan toan) OR (van toan))) or (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu nganh - hanh tranh cua nhung cong ((((dan toan) OR (van toan))) OR (dan than)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu nganh - hanh tranh cua nhung cong ((((dan toan) OR (van toan))) or (dan than)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu nganh - hanh tranh cua nhung cong ((((dan toan) OR (van toan))) or (dan than)) cau*.