Perhaps you should try some spelling variations:
mitigation techniques » imputation techniques
floatation technique » inhalation technique, implantation technique, imputation techniques
no2 mitigation » _ mitigation, error mitigation
based code » based anode
based no2 » based co, based n

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 no2 mitigation techniques ) OR ( learning-based code floatation technique ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( learning-based no2 mitigation techniques ) OR ( learning-based code floatation technique ))".
• Adding a wildcard symbol may retrieve word variants: (( learning-based no2 mitigation techniques ) OR ( learning-based code floatation technique ))*.