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