Perhaps you should try some spelling variations:
mitigation techniques » imputation techniques
reduction techniques » reduction technique, imputation techniques
novel reduction » model reduction, poverty reduction, closed reduction
n mitigation » _ mitigation, _ litigation
based novel » based anodes
based n » based _, based k, based no2

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( learning-based novel reduction techniques ) OR ( learning-based n mitigation techniques ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( learning-based novel reduction techniques ) OR ( learning-based n mitigation techniques ))".
• Adding a wildcard symbol may retrieve word variants: (( learning-based novel reduction techniques ) OR ( learning-based n mitigation techniques ))*.