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