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
cua duong » cua dong, cua huong, qua duong
cong dang » cong dong, cong dung, cong danh
tang cua » mang cua, hang cua, tang luan
cong dan » cong san, cong tan, huong dan
hanh ca » hanh cac, hanh cat, hanh cua

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 cua duong ((cong dang) OR (cong dan)) hanh ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu nganh) OR (hieu manh)) - hanh tang cua duong ((cong dang) OR (cong dan)) hanh ca*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu nganh) or (hieu manh)) - hanh tang cua duong ((cong dang) OR (cong dan)) hanh ca*".