Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hanh tram » hanh trang, thanh tran, thanh tra
doc hieu » toc thieu, hoc thieu, hoc hien
hanh tam » thanh tam, nhanh tam, hanh lam
san than » sang than, san thanh, ban than
than cao » toan cao, thai cao, 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 tram) or (hanh tam)) van ((nhung cong) OR (thong cong)) san than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu nganh - ((hanh tram) OR (hanh tam)) van ((nhung cong) OR (thong cong)) san than cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu nganh - ((hanh tram) or (hanh tam)) van ((nhung cong) OR (thong cong)) san than cao*".