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

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: (("iteration theory: advances and applications") OR ("operators theory: advances and applications"))*.
• Removing quotes may allow a broader search: (( iteration theory: advances and applications ) or ( operators theory: advances and applications ))*.