Perhaps you should try some spelling variations:
"materials optimization" » "material optimization", "criteria optimization", "mathematical optimization"
"automatic optimization" » "quadratic optimization", "stochastic optimization", "geometric 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 ("models optimization"))) OR ("automatic optimization"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"materials optimization\") OR (\"models optimization\"))) or (\"automatic optimization\"))*".
• Removing quotes may allow a broader search: (((( materials optimization ) OR ( models optimization ))) or ( automatic optimization ))*.