Perhaps you should try some spelling variations:
justification literature » classification literature, identification literature, verification literature
identification signature » identification structure, identification feature, identification secure
heteronymes, » heteronyms,, heteronyme,, heteronymous,

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• If you are trying to use Boolean operators, they must be ALL CAPS: "((mystification litteraire) OR (((justification literature) OR (identification signature)))), heteronymes, individu,philosophie, existence, metaphysique, (litterature" OR literatures").
• Removing quotes may allow a broader search: ((mystification litteraire) or (((justification literature) or (identification signature)))), heteronymes, individu,philosophie, existence, metaphysique, (litterature OR literatures ).
• Adding a wildcard symbol may retrieve word variants: "((mystification litteraire) or (((justification literature) or (identification signature)))), heteronymes, individu,philosophie, existence, metaphysique, (litterature" OR literatures")*.