Perhaps you should try some spelling variations:
"pollutants dispersion reduction" » "pollution dispersion reduction", "pollutants detection reduction", "pollutants dispersion prediction", "pollutants dispersion predictions", "pollutants dimension reduction"
"pollutant dispersion reduction" » "pollutant dispersion prediction", "pollutant dispersion predictions", "pollutant dimension reduction"
"pollutant emission reduction" » "pollutant emissions reduction", "pollutant deposition reduction", "pollutant dimension reduction"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("pollutant emission reduction") OR ((("pollutants dispersion reduction") OR ("pollutant dispersion reduction")))).
• Removing quotes may allow a broader search: (( pollutant emission reduction ) or ((( pollutants dispersion reduction ) or ( pollutant dispersion reduction )))).
• Adding a wildcard symbol may retrieve word variants: (("pollutant emission reduction") or ((("pollutants dispersion reduction") or ("pollutant dispersion reduction"))))*.