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