Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
hieu xanh » chieu xanh, hieu manh, dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
cong vinh » cong trinh, trong vinh, cong viec
vinh toan » tinh toan, hinh toan, minh toan
cua dung » cua dong, qua dung, cua rung
cua dang » cua cong, cua ban
toan ban » van ban

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