Perhaps you should try some spelling variations:
materials optimization » criteria optimization, mathematical optimization
material optimization » numerical optimization, criteria optimization, mathematical 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 (models optimization)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((materials optimization) OR (material optimization))) or (models optimization))".
• Adding a wildcard symbol may retrieve word variants: ((((materials optimization) OR (material optimization))) or (models optimization))*.