Perhaps you should try some spelling variations:
"learning-based no2de imputation techniques" » "learning-based no2de implantation technique", "learning-based no2de augmentation techniques", "learning-based no2de segmentation techniques", "learning-based anode imputation techniques", "learning-based no2 imputation techniques", "learning-based anodes imputation techniques"
"learning-based code mitigation techniques" » "learning-based anode mitigation 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 code mitigation techniques") OR ("learning-based no2de imputation techniques"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"learning-based code mitigation techniques\") OR (\"learning-based no2de imputation techniques\"))*".
• Removing quotes may allow a broader search: (( learning-based code mitigation techniques ) OR ( learning-based no2de imputation techniques ))*.