Perhaps you should try some spelling variations:
"automatic optimization" » "quadratic optimization", "automatic estimation", "stochastic optimization"
"material optimization" » "numerical optimization", "criteria optimization", "combinatorial optimization"
"mathematical optimization" » "mathematics 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: (((("mathematical optimization") OR ("automatic optimization"))) OR ("material optimization")).
• Removing quotes may allow a broader search: (((( mathematical optimization ) or ( automatic optimization ))) or ( material optimization )).
• Adding a wildcard symbol may retrieve word variants: (((("mathematical optimization") or ("automatic optimization"))) or ("material optimization"))*.