Perhaps you should try some spelling variations:
"learning-based 3d mitigation techniques" » "learning-based 3d imputation techniques", "learning-based _ mitigation techniques", "learning-based _ litigation techniques", "learning-based co mitigation techniques", "learning-based k mitigation techniques"
"learning-based n inhalation technique" » "learning-based n floatation technique", "learning-based n implantation technique", "learning-based n imputation techniques", "learning-based _ inhalation technique", "learning-based _ inflation technique", "learning-based k inflation technique", "learning-based k inhalation technique", "learning-based no2 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 n inhalation technique") OR ("learning-based 3d mitigation techniques"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"learning-based n inhalation technique\") OR (\"learning-based 3d mitigation techniques\"))".
• Removing quotes may allow a broader search: (( learning-based n inhalation technique ) OR ( learning-based 3d mitigation techniques )).
• Adding a wildcard symbol may retrieve word variants: (("learning-based n inhalation technique") OR ("learning-based 3d mitigation techniques"))*.