Perhaps you should try some spelling variations:
asimetria legislacion » legeria legislacion (Expand Search), agraria legislacion (Expand Search), aparceria legislacion (Expand Search)
asimetria regulacion » historia regulacion (Expand Search), minera regulacion (Expand Search)
"Asimetría legislacion federal" » "Asimetría legislacion general" (Expand Search), "Asimetría legislacion foral" (Expand Search), "Asimetría legislacion forestal" (Expand Search)
"Asimetría regulacion federal" » "Asimetría regulacion general" (Expand Search), "Asimetría regulacion temporal" (Expand Search), "Asimetría regulacion integral" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("Asimetría legislacion federal") OR ("Asimetría regulacion federal"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"Asimetría legislacion federal\") OR (\"Asimetría regulacion federal\"))".
• Removing quotes may allow a broader search: (( Asimetría legislacion federal ) OR ( Asimetría regulacion federal )).
• Adding a wildcard symbol may retrieve word variants: (("Asimetría legislacion federal") OR ("Asimetría regulacion federal"))*.