Perhaps you should try some spelling variations:
"operation theory: advances and applications" » "operations theory: advances and applications", "operator theory: advances and applications", "generation theory: advances and applications"
"iteration theory: advances and applications" » "interaction theory: advances and applications", "vibration theory: advances and applications", "interpolation theory: advances and applications"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("operation theory: advances and applications") OR ("iteration theory: advances and applications"))) OR ("integration theory: advances and applications")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"operation theory: advances and applications\") OR (\"iteration theory: advances and applications\"))) or (\"integration theory: advances and applications\"))".
• Removing quotes may allow a broader search: (((( operation theory: advances and applications ) OR ( iteration theory: advances and applications ))) or ( integration theory: advances and applications )).
• Adding a wildcard symbol may retrieve word variants: (((("operation theory: advances and applications") OR ("iteration theory: advances and applications"))) or ("integration theory: advances and applications"))*.