Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
hanh trinh » hanh chinh
quang dung » quang trung, ung dung, cuong dung
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
toan cao » toan tap
toan ban » van 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 trinh) OR (canh tranh)) quang dung cong tan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu nganh - ((hanh trinh) OR (canh tranh)) quang dung cong tan ((toan cao) OR (toan ban))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu nganh - ((hanh trinh) OR (canh tranh)) quang dung cong tan ((toan cao) or (toan ban))*".