Perhaps you should try some spelling variations:
"immigrants agricultural laws mexico." » "migrant agricultural laws mexico.", "immigrants cultural laws mexico.", "immigrants agricultural laborers mexico.", "immigrants agricultural law mexico.", "immigrants agricultural class mexico.", "immigrants agricultural blacks mexico."
"immigrants cuba laboral mexico." » "immigrants chile laboral mexico.", "immigrants cuba labor mexico.", "immigrants cuba laborers mexico.", "immigrants cuba electoral mexico.", "immigrants guia laboral mexico.", "immigrants clima laboral mexico.", "immigrants carga laboral mexico."

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: (("immigrants cuba laboral mexico.") or ("immigrants agricultural laws mexico."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("immigrants cuba laboral mexico.") OR ("immigrants agricultural laws mexico.")).
• Removing quotes may allow a broader search: (( immigrants cuba laboral mexico. ) or ( immigrants agricultural laws mexico. )).
• Adding a wildcard symbol may retrieve word variants: (("immigrants cuba laboral mexico.") or ("immigrants agricultural laws mexico."))*.