Perhaps you should try some spelling variations:
"pollutants dispersion reduction" » "pollutant dispersion reduction", "pollutants detection reduction", "pollutants dispersion prediction", "pollutants dispersion predictions", "pollutants dimension reduction"
"pollution dispersion reduction" » "pollution dispersion prediction", "pollution dispersion predictions", "pollution dimension reduction", "pollutant dispersion reduction"
"pollutant diffusion reduction" » "pollutant dispersion reduction", "constant diffusion reduction", "pollutant diffusion prediction", "pollutant diffusion reaction", "pollutant diffusion reflection"

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 dispersion reduction") OR ("pollution dispersion reduction")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"pollutant diffusion reduction\") or (((\"pollutants dispersion reduction\") OR (\"pollution dispersion reduction\"))))".
• Removing quotes may allow a broader search: (( pollutant diffusion reduction ) or ((( pollutants dispersion reduction ) OR ( pollution dispersion reduction )))).
• Adding a wildcard symbol may retrieve word variants: (("pollutant diffusion reduction") or ((("pollutants dispersion reduction") OR ("pollution dispersion reduction"))))*.