Perhaps you should try some spelling variations:
"learning-based n limitation techniques" » "learning-based n mitigation techniques", "learning-based n augmentation techniques", "learning-based n segmentation techniques", "learning-based _ limitations techniques", "learning-based co limitation techniques", "learning-based _ limitation techniques", "learning-based k limitation techniques", "learning-based no2 limitation techniques"
"learning-based nde imputation techniques" » "learning-based nde implantation technique", "learning-based nde augmentation techniques", "learning-based nde segmentation techniques", "learning-based anode imputation techniques", "learning-based code imputation techniques", "learning-based 3d imputation techniques", "learning-based _de imputation techniques", "learning-based kde imputation techniques", "learning-based no2de 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 n limitation techniques") OR ("learning-based nde imputation techniques"))~.
• Removing quotes may allow a broader search: (( learning-based n limitation techniques ) or ( learning-based nde imputation techniques ))~.
• Adding a wildcard symbol may retrieve word variants: (("learning-based n limitation techniques") or ("learning-based nde imputation techniques"))*.