Perhaps you should try some spelling variations:
"learning-based co implantation technique" » "learning-based co imputation techniques", "learning-based co floatation technique", "learning-based co inhalation technique", "learning-based novel implantation technique", "learning-based no2 implantation technique", "learning-based two implantation technique", "learning-based _ implantation technique"
"learning-based code limitation techniques" » "learning-based code imputation techniques", "learning-based code mitigation techniques", "learning-based code augmentation techniques", "learning-based co limitation techniques", "learning-based food limitation techniques", "learning-based anode limitation techniques", "learning-based no2de limitation techniques", "learning-based twode limitation techniques", "learning-based _de limitation 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 co implantation technique") or ("learning-based code limitation techniques"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("learning-based co implantation technique") OR ("learning-based code limitation techniques")).
• Removing quotes may allow a broader search: (( learning-based co implantation technique ) or ( learning-based code limitation techniques )).
• Adding a wildcard symbol may retrieve word variants: (("learning-based co implantation technique") or ("learning-based code limitation techniques"))*.