Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu manh » chieu xanh, hieu nganh, dieu hanh
trinh cua » tinh cua, trinh luat, trinh quan
hang cong » dang cong, bang cong, thanh cong
hang nong » thang long, han tong
doc hieu » toc thieu, hoc thieu, hoc hien
toan tap » toan 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 manh - hanh trinh cua ((hang cong) OR (hang nong)) ban ((van ban) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - hanh trinh cua ((hang cong) OR (hang nong)) ban ((van ban) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu manh - hanh trinh cua ((hang cong) OR (hang nong)) ban ((van ban) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - hanh trinh cua ((hang cong) OR (hang nong)) ban ((van ban) or (toan tap))*.