Perhaps you should try some spelling variations:
augmentation techniques » segmentation techniques, imputation techniques
mitigation techniques » imputation techniques
no2 augmentation » data augmentation
k mitigation » _ mitigation, _ litigation
based no2 » based co, based n
based k » based _, based n, 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 no2 augmentation techniques ) OR ( learning-based k mitigation techniques ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( learning-based no2 augmentation techniques ) OR ( learning-based k mitigation techniques ))".
• Adding a wildcard symbol may retrieve word variants: (( learning-based no2 augmentation techniques ) OR ( learning-based k mitigation techniques ))*.