Perhaps you should try some spelling variations:
"mexicana united clase social conditions." » "mexicans united clase social conditions.", "mexican united clase social conditions.", "americans united clase social conditions.", "mexicana unitec late social conditions.", "mexicana united clases sociales conditions."
"mexicana united states social conditions." » "mexicans united states social conditions.", "mexican united states social conditions.", "americans united states social conditions.", "mexicana united state social conditions."

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: (("mexicana united clase social conditions.") or ("mexicana united states social conditions."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("mexicana united clase social conditions.") OR ("mexicana united states social conditions.")).
• Removing quotes may allow a broader search: (( mexicana united clase social conditions. ) or ( mexicana united states social conditions. )).
• Adding a wildcard symbol may retrieve word variants: (("mexicana united clase social conditions.") or ("mexicana united states social conditions."))*.