Perhaps you should try some spelling variations:
regulaciones internacionales » relaciones internacionales, legislaciones internacionales, negociaciones internacionales
estudios internacionales » tratados internacionales, negocios internacionales, economicos internacionales
mexico regulaciones » mexico relaciones, mexico reflexiones, mexico migraciones
mexico estudios » mexico estados

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

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