Perhaps you should try some spelling variations:
regulacion internacional » regulaciones internacionales, regeneracion internacional, circulacion internacional
estudios internacionales » tratados internacionales, negocios internacionales, economicos internacionales
mexico regulacion » mexico educacion, mexico revolucion, mexico evaluacion
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 regulacion internacional. ) or ( mexico estudios internacionales. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( mexico regulacion internacional. ) OR ( mexico estudios internacionales. )).
• Adding a wildcard symbol may retrieve word variants: (( mexico regulacion internacional. ) or ( mexico estudios internacionales. ))*.