Perhaps you should try some spelling variations:
"pollutants dispersion relation" » "pollution 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 dimension reduction", "pollution dimensional reduction", "pollution dimension reductions"
"pollutant dispersion reduction" » "pollutant dispersion predictions", "pollutant dimension reduction", "pollutant dispersion equation"
"pollutant diffusion reduction" » "constant diffusion reduction", "pollutant diffusion prediction", "pollutant diffusion reaction", "pollutant diffusion reflection"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("pollutant diffusion reduction") OR ("pollution dimensions reduction"))) OR ((((("pollutant dispersion reduction") OR ("pollutant dispersion prediction"))) OR ("pollutants dispersion relation")))).
• Removing quotes may allow a broader search: (((( pollutant diffusion reduction ) or ( pollution dimensions reduction ))) or ((((( pollutant dispersion reduction ) or ( pollutant dispersion prediction ))) or ( pollutants dispersion relation )))).
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