Perhaps you should try some spelling variations:
indication techniques » imputation techniques, inhalation technique, reduction techniques
mitigation techniques » imputation techniques
sensor mitigation » error mitigation
code indication » novel indication
gas sensor » gas sensors
based code » based anode

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( learning-gas sensor mitigation techniques ) OR ( learning-based code indication techniques ))~".
• Adding a wildcard symbol may retrieve word variants: (( learning-gas sensor mitigation techniques ) OR ( learning-based code indication techniques ))*.