Perhaps you should try some spelling variations:
"El revista internacional y América Latina." » "El revista internacional de América Latina.", "El revista internacional en América Latina.", "El revista internacional del América Latina."
"El sistema nacional y América Latina." » "El sistema nacional de América Latina.", "El sistema nacional del América Latina."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("El sistema nacional y América Latina.") OR ("El revista internacional y América Latina."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"El sistema nacional y América Latina.\") OR (\"El revista internacional y América Latina.\"))*".
• Removing quotes may allow a broader search: (( El sistema nacional y América Latina. ) OR ( El revista internacional y América Latina. ))*.