Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
nhung cong » dung cong, thong cong, hang cong
hoc hieu » hoc thieu, hoc hien, doc hieu
trang va » tran van
cong dan » cong san, cong tan, huong dan
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu

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