Perhaps you should try some spelling variations:
"learning-based co segmentation techniques" » "learning-based co augmentation techniques", "learning-based 3d segmentation techniques", "learning-based code segmentation techniques", "learning-based no2 segmentation techniques", "learning-based _ segmentation techniques"
"learning-based two imputation techniques" » "learning-based two implantation technique", "learning-based two augmentation techniques", "learning-based two floatation technique", "learning-based tool imputation techniques"

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 co segmentation techniques") or ("learning-based two imputation techniques"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("learning-based co segmentation techniques") OR ("learning-based two imputation techniques"))*.
• Removing quotes may allow a broader search: (( learning-based co segmentation techniques ) or ( learning-based two imputation techniques ))*.