Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
doc hieu » toc thieu, hoc thieu, hoc hien
anh tang » anh bang, anh nang, anh sang
anh dang » anh dong, anh dung, anh bang
va thong » va thuong, va phuong, he thong
cong dan » cong san, cong tan, cong dong
than ban » thanh ban, toan ban, than man

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 - ((anh tang) or (anh dang)) va thong ((cong dan) OR (huong dan)) than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu nganh - ((anh tang) OR (anh dang)) va thong ((cong dan) OR (huong dan)) than ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu nganh - ((anh tang) or (anh dang)) va thong ((cong dan) OR (huong dan)) than ban".
• Adding a wildcard symbol may retrieve word variants: doc hieu nganh - ((anh tang) or (anh dang)) va thong ((cong dan) OR (huong dan)) than ban*.