Perhaps you should try some spelling variations:
"learning-based n augmentation techniques" » "learning-based n segmentation techniques", "learning-based data augmentation techniques", "learning-based _ augmentation techniques", "learning-based k augmentation techniques", "learning-based no2 augmentation techniques"
"learning-based n imputation techniques" » "learning-based n implantation technique", "learning-based n segmentation techniques", "learning-based n floatation technique", "learning-based _ computation techniques", "learning-based _ reputation techniques", "learning-based _ imputation techniques", "learning-based k imputation techniques", "learning-based no2 imputation techniques"

Try widening your search to All Fields.

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