Perhaps you should try some spelling variations:
utilization » utilizacion, utilizaron, civilization
reutilizacion » utilizacion, fertilizacion
optimization » optimizacion
factorization » autorizacion, sectorizacion
optimisation » optimizacion, optimezation, utilisation
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: (((utilization OR reutilizacion) or optimization) or (factorization or optimisation)) of same~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((utilization OR reutilizacion) OR optimization) OR (factorization OR optimisation)) of same.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((utilization OR reutilizacion) or optimization) or (factorization or optimisation)) of same".
• Adding a wildcard symbol may retrieve word variants: (((utilization OR reutilizacion) or optimization) or (factorization or optimisation)) of same*.