Perhaps you should try some spelling variations:
augmentation techniques » segmentation techniques, imputation techniques
inhalation technique » floatation technique, implantation technique, imputation techniques
co inhalation » _ inhalation
gas sensor » gas sensors
based co » based code, based no2, based two

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 co inhalation technique ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-gas sensor augmentation techniques ) OR ( learning-based co inhalation technique )).
• Adding a wildcard symbol may retrieve word variants: (( learning-gas sensor augmentation techniques ) or ( learning-based co inhalation technique ))*.