Perhaps you should try some spelling variations:
indication techniques » imputation techniques, inhalation technique, reduction techniques
mitigation techniques » imputation techniques
sensors mitigation » error mitigation
code indication » novel indication
gas sensors » gas sensor
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 sensors mitigation techniques ) or ( learning-based code indication techniques ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-gas sensors mitigation techniques ) OR ( learning-based code indication techniques )).
• Adding a wildcard symbol may retrieve word variants: (( learning-gas sensors mitigation techniques ) or ( learning-based code indication techniques ))*.