Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, hien hanh
tranh cua » manh cua
doanh cua » doanh luan
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap

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) or (dieu hanh)) - hanh ((tranh cua) or (doanh cua)) dung cong dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (dieu hanh)) - hanh ((tranh cua) OR (doanh cua)) dung cong dan than tap.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) or (dieu hanh)) - hanh ((tranh cua) or (doanh cua)) dung cong dan than tap*.