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