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"

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