Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
hieu manh » chieu xanh, dieu hanh, hien hanh
hanh tang » hanh trang, anh tang, hanh mang
dong cong » duong cong, dung cong, dang cong
tang qua » tang quan, tang cua, tang quy
qua dong » quan dong, qua duong, qua song
cong dan » cong san, cong tan, huong dan
dan van » dang van, doan van, dao van
van bac » van ban, van bao, van hac

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) or (hieu manh)) - hanh tang qua dong cong dan van bac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu nganh) OR (hieu manh)) - hanh tang qua dong cong dan van bac*.