Perhaps you should try some spelling variations:
"learning-based co augmentation techniques" » "learning-based co imputation techniques", "learning-based data augmentation techniques", "learning-based code augmentation techniques", "learning-based no2 augmentation techniques", "learning-based _ augmentation techniques"
"learning-based two segmentation techniques" » "learning-based two imputation techniques", "learning-based 3d segmentation techniques", "learning-based tool segmentation 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 augmentation techniques") or ("learning-based two segmentation techniques"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("learning-based co augmentation techniques") OR ("learning-based two segmentation techniques"))*.
• Removing quotes may allow a broader search: (( learning-based co augmentation techniques ) or ( learning-based two segmentation techniques ))*.