Perhaps you should try some spelling variations:
"materials optimization" » "material optimization", "criteria optimization", "models optimization"
"automatic estimation" » "automatic optimization", "automatic evaluation", "automatic derivation"
"automatic extraction" » "automatic detection"

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 ((("automatic estimation") OR ("automatic extraction")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"materials optimization\") or (((\"automatic estimation\") OR (\"automatic extraction\"))))".
• Removing quotes may allow a broader search: (( materials optimization ) or ((( automatic estimation ) OR ( automatic extraction )))).
• Adding a wildcard symbol may retrieve word variants: (("materials optimization") or ((("automatic estimation") OR ("automatic extraction"))))*.