Perhaps you should try some spelling variations:
"learning-based n mitigation techniques" » "learning-based n imputation techniques", "learning-based _ mitigation techniques", "learning-based _ litigation techniques", "learning-based k mitigation techniques", "learning-based no2 mitigation techniques"
"learning-based 3d inhalation technique" » "learning-based 3d floatation technique", "learning-based 3d implantation technique", "learning-based 3d imputation techniques", "learning-based _ inhalation technique", "learning-based co inhalation technique", "learning-based k inhalation technique"

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 3d inhalation technique") OR ("learning-based n mitigation techniques"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"learning-based 3d inhalation technique\") OR (\"learning-based n mitigation techniques\"))".
• Removing quotes may allow a broader search: (( learning-based 3d inhalation technique ) OR ( learning-based n mitigation techniques )).
• Adding a wildcard symbol may retrieve word variants: (("learning-based 3d inhalation technique") OR ("learning-based n mitigation techniques"))*.