Perhaps you should try some spelling variations:
mitigation techniques » imputation techniques
reduction techniques » reduction technique, imputation techniques
k mitigation » _ mitigation, _ litigation
n reduction » _ reduction, _ prediction, _ production
based n » based _, based no2, based 3d
based k » based _, based 3d, based co

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