Perhaps you should try some spelling variations:
"learning-based n imputation techniques" » "learning-based n implantation technique", "learning-based n augmentation techniques", "learning-based n segmentation techniques", "learning-based _ computation techniques", "learning-based _ reputation techniques", "learning-based _ imputation techniques", "learning-based k imputation techniques", "learning-based no2 imputation techniques"
"learning-based anodes floatation techniques" » "learning-based anodes floatation technique", "learning-based anodes inhalation technique", "learning-based anodes mitigation techniques", "learning-based anode floatation techniques", "learning-based code floatation 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 n imputation techniques") or ("learning-based anodes floatation techniques"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("learning-based n imputation techniques") OR ("learning-based anodes floatation techniques"))*.
• Removing quotes may allow a broader search: (( learning-based n imputation techniques ) or ( learning-based anodes floatation techniques ))*.