Perhaps you should try some spelling variations:
mitigation techniques » imputation techniques
inhalation technique » floatation technique, implantation technique, imputation techniques
ko2 inhalation » _ inhalation
a mitigation » _ mitigation, _ litigation
based ko2 » based no2, based co, based k
based a » based _, based k, 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 ko2 inhalation technique ) or ( learning-based a mitigation techniques ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-based ko2 inhalation technique ) OR ( learning-based a mitigation techniques )).
• Adding a wildcard symbol may retrieve word variants: (( learning-based ko2 inhalation technique ) or ( learning-based a mitigation techniques ))*.