Perhaps you should try some spelling variations:
mitigation techniques » imputation techniques
floatation technique » inhalation technique, implantation technique, imputation techniques
no2 floatation » _ floatation
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 no2 floatation technique ) OR ( learning-based co mitigation techniques ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( learning-based no2 floatation technique ) OR ( learning-based co mitigation techniques ))".
• Adding a wildcard symbol may retrieve word variants: (( learning-based no2 floatation technique ) OR ( learning-based co mitigation techniques ))*.