Perhaps you should try some spelling variations:
"observations theory: advances and applications" » "observations thereon: advances and applications", "observations towards: advances and applications"
"generation theory: advances and applications" » "generation theorem: advances and applications", "generative theory: advances and applications", "iteration theory: advances and applications"
"operations theory: advances and applications" » "operators theory: advances and applications", "operator theory: advances and applications", "relations theory: advances and applications"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("generation theory: advances and applications") OR ((("operations theory: advances and applications") OR ("observations theory: advances and applications")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"generation theory: advances and applications\") or (((\"operations theory: advances and applications\") OR (\"observations theory: advances and applications\"))))".
• Removing quotes may allow a broader search: (( generation theory: advances and applications ) or ((( operations theory: advances and applications ) OR ( observations theory: advances and applications )))).
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