Perhaps you should try some spelling variations:
"pollutants dispersion predictions" » "pollutants dispersion prediction", "pollutants dispersion relations", "pollutants distortion prediction", "pollutant dispersion predictions", "pollution dispersion predictions", "pollutants detection predictions"
"pollutant discussion reflection" » "pollutant discussion reflections", "pollutant discussions reflections", "pollutant discussion electron", "pollutants discussion reflection", "pollutant dispersion reflection", "pollutant diffusion reflection"
"pollutants dimension reduction" » "pollutants discussion reduction", "pollutant dispersion reduction", "pollutants detection reduction", "pollutants dimensionality reduction"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("pollutant discussion reflection") OR ((("pollutants dispersion predictions") OR ("pollutants dimension reduction")))).
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