Perhaps you should try some spelling variations:
energy reduction » energy radiation, energy transduction, energy function
potential cost » potential costs, potential host, potential causes
cost emission » costs emission, cost mission, post remission
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 cost emission AND ((energy reduction) OR (energy production)).
• Adding a wildcard symbol may retrieve word variants: potential cost emission and ((energy reduction) or (energy production))*.