Perhaps you should try some spelling variations:
materials optimization » mathematical optimization
material optimization » numerical optimization, mathematical optimization, combinatorial optimization
models optimization » model optimization, modeling optimization

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: ((((materials optimization) OR (((material optimization) OR (criteria optimization))))) OR (models optimization)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((materials optimization) or (((material optimization) OR (criteria optimization))))) or (models optimization))".
• Adding a wildcard symbol may retrieve word variants: ((((materials optimization) or (((material optimization) OR (criteria optimization))))) or (models optimization))*.