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