Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
hanh trang » thanh trung, canh tranh, hanh trinh
cua thuong » cua truong, cua phuong, ca thuong
doc hieu » toc thieu, hoc thieu, hoc hien
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban

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 trang ((cua cong) or (cua thuong)) cong tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu nganh - hanh trang ((cua cong) OR (cua thuong)) cong tac toan tap.
• Adding a wildcard symbol may retrieve word variants: doc hieu nganh - hanh trang ((cua cong) or (cua thuong)) cong tac toan tap*.