Perhaps you should try some spelling variations:
"pollutants dispersion predictions" » "pollutants dispersion prediction", "pollutants dispersion relations", "pollutants distortion prediction", "pollutant dispersion predictions", "pollutants detection predictions"
"pollution dispersion equation" » "pollutant dispersion equation", "pollution dispersive equations", "pollution dispersion relation", "pollution dispersion relations"
"pollutant dimension reduction" » "pollutant dispersion reduction", "pollutant diffusion reduction", "pollution dimensions 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 dispersion equation") OR ("pollutants dispersion predictions")))).
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