Perhaps you should try some spelling variations:
"learning-based a imputation techniques" » "learning-based a implantation technique", "learning-based a augmentation techniques", "learning-based a segmentation techniques", "learning-based data imputation techniques", "learning-based _ computation techniques", "learning-based _ reputation techniques", "learning-based _ imputation techniques", "learning-based k imputation techniques", "learning-based n 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 k inhalation technique", "learning-based n 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 a inhalation technique") or ("learning-based a imputation techniques"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("learning-based a inhalation technique") OR ("learning-based a imputation techniques"))*.
• Removing quotes may allow a broader search: (( learning-based a inhalation technique ) or ( learning-based a imputation techniques ))*.