Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
hieu manh » chieu xanh, dieu hanh, hien hanh
dang cong » dung cong
manh toan » thanh toan, anh tuan, tinh toan
anh mang » hanh mang, anh bang, anh dang
mang cua » manh cua, dung cua, ban cua
cua dang » cua cong, cua ban
dan toan » van toan, dan than, xuan toan

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 manh) OR (hieu nganh)) - anh mang cua dang cong ((dan toan) or (manh toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu nganh)) - anh mang cua dang cong ((dan toan) OR (manh toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) OR (hieu nganh)) - anh mang cua dang cong ((dan toan) or (manh toan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) OR (hieu nganh)) - anh mang cua dang cong ((dan toan) or (manh toan)) cao*.