Perhaps you should try some spelling variations:
"sobre literatura mexican / catedra jaime torres jose" » "sobre literatura americana / catedra jaime torres jose", "sobre literature american / catedra jaime torres jose", "sobre literatura medico / catedra jaime torres jose", "entre literatura mexican / catedra jaime torres jose", "de literatura mexican / catedra jaime torres jose", "e literatura mexican / catedra jaime torres jose"
"sobre literatura mexicana / catedra jaime torres jose" » "sobre literatura americanaa / catedra jaime torres jose", "sobre literature americana / catedra jaime torres jose", "sobre literatura medicoa / catedra jaime torres jose", "entre literatura mexicana / catedra jaime torres jose", "de literatura mexicana / catedra jaime torres jose", "e literatura mexicana / catedra jaime torres jose"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"sobre literatura mexican / catedra jaime torres jose\") OR (\"sobre literatura mexicana / catedra jaime torres jose\"))".
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