Perhaps you should try some spelling variations:
"operations theory, advances and applications" » "operators theory, advances and applications", "observations theory, advances and applications", "relations theory, advances and applications"
"operation theory, advances and applications" » "generation theory, advances and applications", "aberration theory, advances and applications", "operation theatre, advances and applications"
"iteration theory, advances and applications" » "integration theory, advances and applications", "interaction theory, advances and applications", "vibration 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 ((("operations theory, advances and applications") OR ("operator 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 (((\"operations theory, advances and applications\") OR (\"operator theory, advances and applications\"))))".
• Removing quotes may allow a broader search: (((( operation theory, advances and applications ) or ( iteration theory, advances and applications ))) or ((( operations theory, advances and applications ) OR ( operator theory, advances and applications )))).
• Adding a wildcard symbol may retrieve word variants: (((("operation theory, advances and applications") or ("iteration theory, advances and applications"))) or ((("operations theory, advances and applications") OR ("operator theory, advances and applications"))))*.