Perhaps you should try some spelling variations:
"learning-based 3d implantation technique" » "learning-based 3d imputation techniques", "learning-based 3d floatation technique", "learning-based _ implantation technique", "learning-based co implantation technique", "learning-based n implantation technique"
"learning-based k inhalation technique" » "learning-based k floatation technique", "learning-based k imputation techniques", "learning-based k inhaler technique", "learning-based _ inhalation technique", "learning-based k inflation technique", "learning-based _ inflation technique", "learning-based n inhalation technique", "learning-based co inhalation technique"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("learning-based k inhalation technique") or ("learning-based 3d implantation technique"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("learning-based k inhalation technique") OR ("learning-based 3d implantation technique")).
• Removing quotes may allow a broader search: (( learning-based k inhalation technique ) or ( learning-based 3d implantation technique )).
• Adding a wildcard symbol may retrieve word variants: (("learning-based k inhalation technique") or ("learning-based 3d implantation technique"))*.