Perhaps you should try some spelling variations:
"learning-based a imputation techniques" » "learning-based a implantation technique", "learning-based a augmentation techniques", "learning-based a segmentation techniques", "learning-based data imputation techniques", "learning-based _ computation techniques", "learning-based _ reputation techniques", "learning-based _ imputation techniques", "learning-based k imputation techniques", "learning-based 3d imputation techniques"
"learning-based n imputation techniques" » "learning-based n implantation technique", "learning-based n augmentation techniques", "learning-based n segmentation techniques", "learning-based _ computation techniques", "learning-based _ reputation techniques", "learning-based _ imputation techniques", "learning-based k imputation techniques", "learning-based no2 imputation techniques"

You may be able to get more results by adjusting your search query.

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