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