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

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("formal languages and automated theory") OR ("formal language and automated theory"))) OR ((("formal languages and automata theory") OR ("formal languages and automatic theory")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"formal languages and automated theory\") OR (\"formal language and automated theory\"))) or (((\"formal languages and automata theory\") or (\"formal languages and automatic theory\"))))".
• Removing quotes may allow a broader search: (((( formal languages and automated theory ) OR ( formal language and automated theory ))) or ((( formal languages and automata theory ) or ( formal languages and automatic theory )))).
• Adding a wildcard symbol may retrieve word variants: (((("formal languages and automated theory") OR ("formal language and automated theory"))) or ((("formal languages and automata theory") or ("formal languages and automatic theory"))))*.