Perhaps you should try some spelling variations:
"pollutants dispersion predictions" » "pollutants dispersion prediction", "pollutants dispersion relations", "pollutants distortion prediction", "pollutant dispersion predictions", "pollution dispersion predictions"
"pollutants dispersion reduction" » "pollutant dispersion reduction", "pollution dispersion reduction", "pollutants dispersion prediction", "pollutants dispersion relation", "pollutants dispersion equation"
"pollutants detection reduction" » "pollution detection reduction", "pollutants degradation reduction", "pollutants defection reduction", "pollutants detection prediction", "pollutants detection reaction"
"pollutant dimension reduction" » "pollutant dispersion reduction", "pollutant diffusion reduction", "pollution dimensions reduction", "pollutant dimensionality 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 dimension reduction") OR ((((("pollutants dispersion reduction") OR ("pollutants detection reduction"))) OR ("pollutants dispersion predictions")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"pollutant dimension reduction\") or (((((\"pollutants dispersion reduction\") OR (\"pollutants detection reduction\"))) or (\"pollutants dispersion predictions\"))))".
• Removing quotes may allow a broader search: (( pollutant dimension reduction ) or ((((( pollutants dispersion reduction ) OR ( pollutants detection reduction ))) or ( pollutants dispersion predictions )))).
• Adding a wildcard symbol may retrieve word variants: (("pollutant dimension reduction") or ((((("pollutants dispersion reduction") OR ("pollutants detection reduction"))) or ("pollutants dispersion predictions"))))*.