Perhaps you should try some spelling variations:
"mathematical models of cognitive processing and neural networks" » "mathematical models of cognitive modeling and neural networks", "mathematical models of cognitive approachesing and neural networks"
"mathematical models of cognitive process and neural networks" » "mathematical models of cognitive approaches and neural networks"
"mathematical models of cognitive processes and neural networks" » "mathematical models of cognitive approacheses and neural networks"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("mathematical models of cognitive process and neural networks") OR ("mathematical models of cognitive processing and neural networks"))) OR ("mathematical models of cognitive wireless and neural networks"))) OR ("mathematical models of cognitive processes and neural networks")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"mathematical models of cognitive process and neural networks\") OR (\"mathematical models of cognitive processing and neural networks\"))) or (\"mathematical models of cognitive wireless and neural networks\"))) or (\"mathematical models of cognitive processes and neural networks\"))".
• Removing quotes may allow a broader search: (((((( mathematical models of cognitive process and neural networks ) OR ( mathematical models of cognitive processing and neural networks ))) or ( mathematical models of cognitive wireless and neural networks ))) or ( mathematical models of cognitive processes and neural networks )).
• Adding a wildcard symbol may retrieve word variants: (((((("mathematical models of cognitive process and neural networks") OR ("mathematical models of cognitive processing and neural networks"))) or ("mathematical models of cognitive wireless and neural networks"))) or ("mathematical models of cognitive processes and neural networks"))*.