Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
cong danh » cuong danh, cong thanh, cong khanh
doc hieu » toc thieu, hoc thieu, hoc hien
manh cua » doanh cua
cong dan » cong san, cong tan, huong dan
phan cau » phan dau, phan cac, phan tu
ban cua » ban quan

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 - canh ((manh cua) or (ban cua)) cong ((cong danh) or (cong dan)) phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - canh ((manh cua) OR (ban cua)) cong ((cong danh) OR (cong dan)) phan cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - canh ((manh cua) or (ban cua)) cong ((cong danh) or (cong dan)) phan cau*.