Perhaps you should try some spelling variations:
simulation techniques » imputation techniques, segmentation techniques, inhalation technique
mitigation techniques » imputation techniques
no2 mitigation » _ mitigation, error mitigation
3d simulation » _ simulation, a simulation, mri simulation
based no2 » based co, based n
based 3d » based _, based co, based k

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 3d simulation techniques ) or ( learning-based no2 mitigation techniques ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-based 3d simulation techniques ) OR ( learning-based no2 mitigation techniques )).
• Adding a wildcard symbol may retrieve word variants: (( learning-based 3d simulation techniques ) or ( learning-based no2 mitigation techniques ))*.