Perhaps you should try some spelling variations:
"learning-based based imputation techniques" » "learning-based based implantation technique", "learning-based based augmentation techniques", "learning-based based segmentation techniques", "learning-based based simulation techniques", "learning-based data imputation techniques", "learning-based closed imputation techniques"
"learning-based k inflation technique" » "learning-based k inhalation technique", "learning-based k implantation technique", "learning-based k mitigation techniques", "learning-based _ inflation technique", "learning-based n inflation technique", "learning-based 3d inflation technique"

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 k inflation technique") or ("learning-based based imputation techniques"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("learning-based k inflation technique") OR ("learning-based based imputation techniques")).
• Removing quotes may allow a broader search: (( learning-based k inflation technique ) or ( learning-based based imputation techniques )).
• Adding a wildcard symbol may retrieve word variants: (("learning-based k inflation technique") or ("learning-based based imputation techniques"))*.