Perhaps you should try some spelling variations:
"ejercicio mexico aspectos metodologicos." » "ejercicio mexico aspectos psicologicos.", "ejercicio medico aspectos metodologicos.", "ejercicio fisico aspectos metodologicos.", "ejercicio critico aspectos metodologicos."
"ejercicio mexico aspectos sociologicos." » "ejercicio mexico aspectos psicologicos.", "ejercicio mexico aspectos economicos.", "ejercicio medico aspectos sociologicos.", "ejercicio fisico aspectos sociologicos.", "ejercicio critico aspectos sociologicos."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("ejercicio mexico aspectos sociologicos.") or ("ejercicio mexico aspectos metodologicos."))~.
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• Adding a wildcard symbol may retrieve word variants: (("ejercicio mexico aspectos sociologicos.") or ("ejercicio mexico aspectos metodologicos."))*.