Perhaps you should try some spelling variations:
"Foundations of modelos economicos series" » "Foundations of modelos economicos spines", "Foundations of modelos economica serie", "Foundations of modelos economicos sociales"
"Foundations of poder economico series" » "Foundations of poder economica serie", "Foundations of poder economico spines", "Foundations of poder economico sociales", "Foundations of orden economico series"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"Foundations of modelos economicos series\") OR (\"Foundations of poder economico series\"))~".
• Removing quotes may allow a broader search: (( Foundations of modelos economicos series ) OR ( Foundations of poder economico series ))~.
• Adding a wildcard symbol may retrieve word variants: (("Foundations of modelos economicos series") OR ("Foundations of poder economico series"))*.