Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
nhung don » nhung van, nhung bo
hang cong » dang cong, hang nong, bang cong
doc hieu » toc thieu, hoc thieu, hoc hien
toan tai » toan tap, doanh tai, toan ban
toan cao » toan ban, toan tap

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 cua ((nhung don) or (hang cong)) dan ((toan tai) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu nganh - hanh tranh cua ((nhung don) OR (hang cong)) dan ((toan tai) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: doc hieu nganh - hanh tranh cua ((nhung don) or (hang cong)) dan ((toan tai) or (toan cao))*.