Perhaps you should try some spelling variations:
"learning-based gel implantation technique" » "learning-based gel floatation technique", "learning-based gel inhalation technique", "learning-based novel implantation technique"
"learning-based mri imputation techniques" » "learning-based mri augmentation techniques", "learning-based mri segmentation techniques", "learning-based mri floatation technique", "learning-based mri simulation techniques", "learning-based mil imputation techniques"

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 gel implantation technique") or ("learning-based mri imputation techniques"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("learning-based gel implantation technique") OR ("learning-based mri imputation techniques"))*.
• Removing quotes may allow a broader search: (( learning-based gel implantation technique ) or ( learning-based mri imputation techniques ))*.