Perhaps you should try some spelling variations:
optimization » optimizacion
utilization » utilizacion, utilizaron, reutilizacion
optimisation » optimizacion, optimezation, utilisation
optimizaron » optimizacion, optimizar, optimizado
factorization » autorizacion, sectorizacion
same » some

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((optimization or utilization) or ((optimisation or optimizaron) or factorization)) of same~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((optimization OR utilization) OR ((optimisation OR optimizaron) OR factorization)) of same.
• Adding a wildcard symbol may retrieve word variants: ((optimization or utilization) or ((optimisation or optimizaron) or factorization)) of same*.