Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh dung » thanh dung, anh dung, hanh dong
hang nong » thang long, han tong
dang cong » dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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 dung cho ((((hang nong) or (dang cong))) or (trong cong)) dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - hanh dung cho ((((hang nong) OR (dang cong))) OR (trong cong)) dan than cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - hanh dung cho ((((hang nong) or (dang cong))) or (trong cong)) dan than cau*.