Perhaps you should try some spelling variations:
"potential c emission and energy reduction" » "potential c emission and energy radiation", "potential c emission and energy transduction", "potential c emission and energy function", "potential co emission and energy reduction", "potential co2 emission and energy reduction", "potential cell emission and energy reduction", "potential 3 emission and energy reduction", "potential 5 emission and energy reduction", "potential 8 emission and energy reduction"
"potential 9 emission and energy reduction" » "potential 9 emission and energy radiation", "potential 9 emission and energy transduction", "potential 9 emission and energy function", "potential 2 emission and energy reduction", "potential 4 emission and energy reduction", "potential 3 emission and energy reduction"
"potential c emission and energy production" » "potential co emission and energy production", "potential co2 emission and energy production", "potential cell emission and energy production", "potential 3 emission and energy production", "potential 5 emission and energy production", "potential 8 emission and energy production", "potential c emission and energy reproduction", "potential c emission and energy introduction"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("potential c emission and energy reduction") OR ("potential 9 emission and energy reduction"))) OR ("potential c emission and energy production")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"potential c emission and energy reduction\") OR (\"potential 9 emission and energy reduction\"))) or (\"potential c emission and energy production\"))".
• Removing quotes may allow a broader search: (((( potential c emission and energy reduction ) OR ( potential 9 emission and energy reduction ))) or ( potential c emission and energy production )).
• Adding a wildcard symbol may retrieve word variants: (((("potential c emission and energy reduction") OR ("potential 9 emission and energy reduction"))) or ("potential c emission and energy production"))*.