Perhaps you should try some spelling variations:
"formal language and automatic theorem" » "formal language and automated theorem", "formal language and automata theory"
"formal languages and automatic theory" » "formal languages and automation theory", "formal languages and automata theory", "formal languages and axiomatic theory"
"formal language and automatic theory" » "formal language and automation theory", "formal language and automata theory", "formal language and axiomatic theory"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("formal languages and automatic theory") OR ((("formal language and automatic theory") OR ("formal language and automatic theorem")))).
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