Perhaps you should try some spelling variations:
augmentation techniques » segmentation techniques, imputation techniques
limitation techniques » imputation techniques, mitigation techniques, segmentation techniques
code limitation » co limitation, food limitation
gas sensor » gas sensors
based code » based anode

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( learning-gas sensor augmentation techniques ) or ( learning-based code limitation techniques ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-gas sensor augmentation techniques ) OR ( learning-based code limitation techniques )).
• Adding a wildcard symbol may retrieve word variants: (( learning-gas sensor augmentation techniques ) or ( learning-based code limitation techniques ))*.