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

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: potential c emission AND ((energy reduction) OR (energy production)).
• Adding a wildcard symbol may retrieve word variants: potential c emission and ((energy reduction) or (energy production))*.