Perhaps you should try some spelling variations:
"pollutant dispersion prediction" » "pollutant distortion prediction", "pollutant dispersion relation", "pollutant conversion prediction"
"pollutant diffusion prediction" » "pollutant diffusion reaction", "pollutant diffusion equation", "pollutant diffusion convection", "constant diffusion prediction", "pollutants dispersion prediction"

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