Perhaps you should try some spelling variations:
augmentation techniques » segmentation techniques, imputation techniques
mitigation techniques » imputation techniques
n augmentation » data augmentation
no2 mitigation » _ mitigation, error mitigation
based no2 » based co
based n » based _, based k, based 3d

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 augmentation techniques ) OR ( learning-based no2 mitigation techniques ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( learning-based n augmentation techniques ) OR ( learning-based no2 mitigation techniques ))".
• Adding a wildcard symbol may retrieve word variants: (( learning-based n augmentation techniques ) OR ( learning-based no2 mitigation techniques ))*.