Perhaps you should try some spelling variations:
"learning-based co implantation technique" » "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 imputation techniques" » "learning-based code augmentation techniques", "learning-based code segmentation techniques", "learning-based code floatation technique", "learning-based anode imputation techniques", "learning-based no2de imputation techniques", "learning-based twode imputation techniques", "learning-based _de imputation techniques"

You may be able to get more results by adjusting your search query.

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