Perhaps you should try some spelling variations:
"economicos internacionales" » "economicas internacionales", "economia internacional"
"contratos internacionales" » "tratados internacionales", "comerciales internacionales", "economicas internacionales"
"contexto internacional" » "congreso internacional", "comercio internacional", "coloquio internacional"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("contratos internacionales") OR ("economicos internacionales"))) or ("contexto internacional"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("contratos internacionales") OR ("economicos internacionales"))) OR ("contexto internacional")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"contratos internacionales\") OR (\"economicos internacionales\"))) or (\"contexto internacional\"))".
• Removing quotes may allow a broader search: (((( contratos internacionales ) OR ( economicos internacionales ))) or ( contexto internacional )).
• Adding a wildcard symbol may retrieve word variants: (((("contratos internacionales") OR ("economicos internacionales"))) or ("contexto internacional"))*.