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