Perhaps you should try some spelling variations:
theo hien » theo chieu, thuc hien, theo tieu
hien hanh » dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo hien hanh - hanh tang luan ((hang cong) OR (dang cong)) ((dan toan) or (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hien hanh - hanh tang luan ((hang cong) OR (dang cong)) ((dan toan) OR (dan than)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hien hanh - hanh tang luan ((hang cong) OR (dang cong)) ((dan toan) or (dan than)) cau".
• Adding a wildcard symbol may retrieve word variants: theo hien hanh - hanh tang luan ((hang cong) OR (dang cong)) ((dan toan) or (dan than)) cau*.