Perhaps you should try some spelling variations:
"pollutant dispersion prediction" » "pollutant distortion prediction", "pollutant diffusion prediction", "pollutant conversion prediction"
"evaluation dimensions reduction" » "evaluation decisions reduction", "evaluation definitions reduction", "evaluation questions reduction", "evaluation dimensional reduction", "evaluation dimension reductions", "evaluation dimensional reductions"
"pollutants dispersion relation" » "pollution dispersion relation", "pollutants detection relation", "pollutants dispersion relations"
"pollution dimensions reduction" » "position dimensions reduction", "solutions dimensions reduction", "conclusion 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"

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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 ("evaluation dimensions reduction"))))) OR ((((("pollutant dispersion reduction") OR ("pollutant dispersion prediction"))) OR ("pollutants dispersion relation")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"pollutant dimension reduction\") or (((\"pollution dimensions reduction\") OR (\"evaluation dimensions reduction\"))))) or (((((\"pollutant dispersion reduction\") or (\"pollutant dispersion prediction\"))) or (\"pollutants dispersion relation\"))))".
• Removing quotes may allow a broader search: (((( pollutant dimension reduction ) or ((( pollution dimensions reduction ) OR ( evaluation dimensions reduction ))))) or ((((( pollutant dispersion reduction ) or ( pollutant dispersion prediction ))) or ( pollutants dispersion relation )))).
• Adding a wildcard symbol may retrieve word variants: (((("pollutant dimension reduction") or ((("pollution dimensions reduction") OR ("evaluation dimensions reduction"))))) or ((((("pollutant dispersion reduction") or ("pollutant dispersion prediction"))) or ("pollutants dispersion relation"))))*.