Perhaps you should try some spelling variations:
"pollutants evaluation prediction" » "pollutants evaluation section", "pollutants evaluation selection", "pollutants situation prediction", "plants evaluation prediction", "pollution evaluation prediction", "pollutants regulation prediction"
"pollutant emissions prediction" » "pollutant emission prediction", "pollutant emissions reduction", "pollutant emissions production"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("pollutant emissions prediction") OR ("pollutants evaluation prediction")).
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