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

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("operator theory: advances and applications") OR ((("iteration theory: advances and applications") OR ("integration theory: advances and applications")))).
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