Perhaps you should try some spelling variations:
"pollutants dispersion reduction" » "pollutant dispersion reduction", "pollution dispersion reduction", "pollutants detection reduction", "pollutants dispersion prediction", "pollutants dispersion predictions", "pollutants dispersion relation"
"pollution dimensions reduction" » "position dimensions reduction", "solutions dimensions reduction", "evaluation dimensions reduction", "pollution dimensional reduction", "pollution dimension reductions", "pollution dimensional reductions"
"pollutant dimension reduction" » "pollutant dispersion reduction", "pollutant diffusion reduction", "pollutant emission reduction", "pollutant dimensionality reduction"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("pollutant dimension reduction") OR ("pollution dimensions reduction"))) OR ("pollutants dispersion reduction")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"pollutant dimension reduction\") OR (\"pollution dimensions reduction\"))) or (\"pollutants dispersion reduction\"))".
• Removing quotes may allow a broader search: (((( pollutant dimension reduction ) OR ( pollution dimensions reduction ))) or ( pollutants dispersion reduction )).
• Adding a wildcard symbol may retrieve word variants: (((("pollutant dimension reduction") OR ("pollution dimensions reduction"))) or ("pollutants dispersion reduction"))*.