Perhaps you should try some spelling variations:
energy transduction » energy transition, energy production, energy transitions
potential metal » potential medical, potential method, potential manual
metal emission » metal emissions, metal fission, total emission

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 metal emission AND energy transduction.
• Adding a wildcard symbol may retrieve word variants: potential metal emission and energy transduction*.