Perhaps you should try some spelling variations:
relaciones interregionales » relaciones internacionales, relaciones interpersonales, relaciones interraciales
region international » regimen internacional, regionalism international, aggression international
serie relaciones » serie religiones, mexico relaciones, serie migraciones
serie region » serie religion, verde region, caribe region

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( serie region international. ) or ( serie relaciones interregionales. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( serie region international. ) OR ( serie relaciones interregionales. )).
• Adding a wildcard symbol may retrieve word variants: (( serie region international. ) or ( serie relaciones interregionales. ))*.