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