Perhaps you should try some spelling variations:
"immigrants agricultural laborers mexico." » "migrant agricultural laborers mexico.", "immigrants agricultural labor mexico.", "immigrants agricultural enborers mexico.", "immigrants agricultural deborers mexico.", "immigrants agricultural eborers mexico."
"immigrants cultural la mexico." » "immigrants cultural en mexico.", "immigrants cultural de mexico.", "immigrants cultural e mexico.", "immigrants cultural a mexico.", "immigrants cultural lena mexico.", "immigrants cultural lira 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 agricultural laborers mexico.") or ("immigrants cultural la mexico."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("immigrants agricultural laborers mexico.") OR ("immigrants cultural la mexico.")).
• Removing quotes may allow a broader search: (( immigrants agricultural laborers mexico. ) or ( immigrants cultural la mexico. )).
• Adding a wildcard symbol may retrieve word variants: (("immigrants agricultural laborers mexico.") or ("immigrants cultural la mexico."))*.