Perhaps you should try some spelling variations:
dong huong » dong thuong, dong duong, cong huong
dung huong » dung thuong, dung phuong, dung luong
hieu manh » chieu xanh, hieu nganh, dieu hanh
hien hanh » dieu hanh
canh manh » lanh manh, canh tranh, cach mang
manh cua » doanh cua, ban cua
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

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