Perhaps you should try some spelling variations:
"pollutants dispersion relation" » "pollutants detection relation", "pollutants dispersion relations"
"pollutant dispersion prediction" » "pollutant distortion prediction", "pollutant diffusion prediction", "pollutant conversion prediction"
"pollution dimensions reduction" » "position dimensions reduction", "solutions dimensions reduction", "evaluation dimensions reduction", "pollution dimensional reduction", "pollution dimension reductions", "pollution dimensional reductions"
"pollutant dispersion reduction" » "pollutant dispersion predictions", "pollutant dispersion equation", "pollutant dispersion section"
"pollutant dimension reduction" » "pollutant diffusion reduction", "pollutant emission reduction", "constant dimension reduction", "pollutant dimensionality reduction"
"pollution dispersion relation" » "pollution dispersion relations"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("pollutant dimension reduction") OR ("pollution dimensions reduction"))) OR ((((("pollutant dispersion reduction") OR ("pollutant dispersion prediction"))) OR ((("pollutants dispersion relation") OR ("pollution dispersion relation")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"pollutant dimension reduction\") or (\"pollution dimensions reduction\"))) or (((((\"pollutant dispersion reduction\") or (\"pollutant dispersion prediction\"))) or (((\"pollutants dispersion relation\") OR (\"pollution dispersion relation\"))))))".
• Removing quotes may allow a broader search: (((( pollutant dimension reduction ) or ( pollution dimensions reduction ))) or ((((( pollutant dispersion reduction ) or ( pollutant dispersion prediction ))) or ((( pollutants dispersion relation ) OR ( pollution dispersion relation )))))).
• Adding a wildcard symbol may retrieve word variants: (((("pollutant dimension reduction") or ("pollution dimensions reduction"))) or ((((("pollutant dispersion reduction") or ("pollutant dispersion prediction"))) or ((("pollutants dispersion relation") OR ("pollution dispersion relation"))))))*.