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" » "pollution dimensions reduction", "pollutant emission reduction", "constant dimension reduction", "pollutant dimensionality reduction"
"pollutant diffusion reduction" » "constant diffusion reduction", "pollutant diffusion prediction", "pollutant diffusion reaction", "pollutant diffusion reflection"

Try widening your search to All Fields.

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 ("pollutant diffusion 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 (\"pollutant diffusion reduction\"))) or (((\"pollutants dispersion reduction\") or (\"pollutant dispersion reduction\"))))".
• Removing quotes may allow a broader search: (((( pollutant dimension reduction ) OR ( pollutant diffusion reduction ))) or ((( pollutants dispersion reduction ) or ( pollutant dispersion reduction )))).
• Adding a wildcard symbol may retrieve word variants: (((("pollutant dimension reduction") OR ("pollutant diffusion reduction"))) or ((("pollutants dispersion reduction") or ("pollutant dispersion reduction"))))*.