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