Perhaps you should try some spelling variations:
pollutants dimension » pollutants dispersion, pollutants discussion, pollutant dispersion
pollutant diffusion » pollutant dispersion, constant diffusion, pollutants dispersion
diffusion reduction » diffusion prediction, diffusion reaction, diffusion reflection
dimension reduction » dimensionality reduction

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( pollutant diffusion reduction ) OR ( pollutants dimension reduction )).
• Adding a wildcard symbol may retrieve word variants: (( pollutant diffusion reduction ) or ( pollutants dimension reduction ))*.