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

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("learning-based k implantation technique") OR ("learning-based k imputation techniques"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"learning-based k implantation technique\") OR (\"learning-based k imputation techniques\"))".
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• Adding a wildcard symbol may retrieve word variants: (("learning-based k implantation technique") OR ("learning-based k imputation techniques"))*.