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

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 co mitigation techniques ) or ( learning-based no2 inhalation technique ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-based co mitigation techniques ) OR ( learning-based no2 inhalation technique )).
• Adding a wildcard symbol may retrieve word variants: (( learning-based co mitigation techniques ) or ( learning-based no2 inhalation technique ))*.