Perhaps you should try some spelling variations:
"politica mexicanas de anestesiologia." » "politica mexicana de anestesiologia.", "politico mexicano de anestesiologia.", "politica americana de anestesiologia.", "politica mexicano de anestesiologia.", "politica mexicana _ anestesiologia."
"climatica mexicana en anestesiologia." » "politica mexicana en anestesiologia.", "climatico mexico en anestesiologia.", "latina mexicana en anestesiologia.", "climatica mexicana de anestesiologia."

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: (("politica mexicanas de anestesiologia.") or ("climatica mexicana en anestesiologia."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("politica mexicanas de anestesiologia.") OR ("climatica mexicana en anestesiologia.")).
• Removing quotes may allow a broader search: (( politica mexicanas de anestesiologia. ) or ( climatica mexicana en anestesiologia. )).
• Adding a wildcard symbol may retrieve word variants: (("politica mexicanas de anestesiologia.") or ("climatica mexicana en anestesiologia."))*.