Perhaps you should try some spelling variations:
"learning-based 3d imputation techniques" » "learning-based 3d implantation technique", "learning-based 3d augmentation techniques", "learning-based 3d segmentation techniques", "learning-based 3d simulation techniques", "learning-based _ imputation techniques", "learning-based co imputation techniques", "learning-based n imputation techniques"
"learning-based k inhalation technique" » "learning-based k floatation technique", "learning-based k implantation technique", "learning-based k inhaler technique", "learning-based _ inhalation technique", "learning-based k inflation technique", "learning-based _ inflation technique", "learning-based n inhalation technique", "learning-based co inhalation technique"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("learning-based k inhalation technique") OR ("learning-based 3d imputation techniques"))~.
• Removing quotes may allow a broader search: (( learning-based k inhalation technique ) or ( learning-based 3d imputation techniques ))~.
• Adding a wildcard symbol may retrieve word variants: (("learning-based k inhalation technique") or ("learning-based 3d imputation techniques"))*.