Perhaps you should try some spelling variations:
"ley del sentido formal y material" » "ley de sentido formal y material" (Expand Search), "ley del senado formal y material" (Expand Search), "ley en sentido formal y material" (Expand Search), "ley del sentido formal y materiales" (Expand Search), "ley del sentido formal de material" (Expand Search), "ley del sentido formal del material" (Expand Search)
"ley el sentido formal y material" » "ley el sentido formal y materiales" (Expand Search), "ley el sentido formal de material" (Expand Search), "ley el sentido formal del material" (Expand Search), "ley en sentido formal y material" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("ley del sentido formal y material") OR ("ley el sentido formal y material"))~.
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• Adding a wildcard symbol may retrieve word variants: (("ley del sentido formal y material") OR ("ley el sentido formal y material"))*.