Perhaps you should try some spelling variations:
augmentation techniques » segmentation techniques, imputation techniques
reduction technique » reduction techniques, truncation technique
no2 augmentation » data augmentation
k reduction » _ reduction, _ prediction, _ production
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 reduction technique ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-based no2 augmentation techniques ) OR ( learning-based k reduction technique )).
• Adding a wildcard symbol may retrieve word variants: (( learning-based no2 augmentation techniques ) or ( learning-based k reduction technique ))*.