Perhaps you should try some spelling variations:
"pollutant decomposition reaction" » "pollutants decomposition reaction", "pollutant deposition reaction", "polygon decomposition reaction", "pollutant decomposition reactions", "pollutant decomposition section", "pollutant decomposition functions"
"tensor decomposition reduction" » "tensor decomposition prediction", "tensor decomposition reflection", "tensor decomposition reputation"
"polar decomposition reaction" » "polar decomposition reactions", "polar decomposition section", "polar decomposition functions", "litter decomposition reaction"

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 decomposition reaction") OR ("polar decomposition reaction"))) OR ("tensor decomposition reduction")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"pollutant decomposition reaction\") OR (\"polar decomposition reaction\"))) or (\"tensor decomposition reduction\"))".
• Removing quotes may allow a broader search: (((( pollutant decomposition reaction ) OR ( polar decomposition reaction ))) or ( tensor decomposition reduction )).
• Adding a wildcard symbol may retrieve word variants: (((("pollutant decomposition reaction") OR ("polar decomposition reaction"))) or ("tensor decomposition reduction"))*.