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