Perhaps you should try some spelling variations:
"pollutants dispersion reduction" » "pollution dispersion reduction", "pollutants detection reduction", "pollutants dispersion prediction", "pollutants dispersion predictions", "pollutants dispersion relation"
"pollutant dispersion reduction" » "pollutant dispersion prediction", "pollutant dispersion predictions", "pollutant dispersion relation"
"pollutant dimension reduction" » "pollutant diffusion reduction", "pollution dimensions reduction", "pollutant emission reduction", "pollutant 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 dimension reduction") OR ((("pollutants dispersion reduction") OR ("pollutant dispersion reduction"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"pollutant dimension reduction\") or (((\"pollutants dispersion reduction\") OR (\"pollutant dispersion reduction\"))))*".
• Removing quotes may allow a broader search: (( pollutant dimension reduction ) or ((( pollutants dispersion reduction ) OR ( pollutant dispersion reduction ))))*.