Perhaps you should try some spelling variations:
"learning-based sensor segmentation techniques" » "learning-based sensor augmentation techniques", "learning-based sensor imputation techniques", "learning-based series segmentation techniques", "learning-based semantic segmentation techniques", "learning-gas sensor segmentation techniques", "learning-based sers segmentation techniques"
"learning-based codeo2 inhaler technique" » "learning-based codeo2 inhalation technique", "learning-based code inhaler 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 sensor segmentation techniques") or ("learning-based codeo2 inhaler technique"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("learning-based sensor segmentation techniques") OR ("learning-based codeo2 inhaler technique"))*.
• Removing quotes may allow a broader search: (( learning-based sensor segmentation techniques ) or ( learning-based codeo2 inhaler technique ))*.