Perhaps you should try some spelling variations:
"colonias americanas de anestesiologia ;" » "colonias agricolas de anestesiologia ;", "colonias americanas del anestesiologia ;", "colonias americana de anestesiologia ;", "colonias americanos de anestesiologia ;"
"cronicas mexicanas de anestesiologia ;" » "cronicas americanas de anestesiologia ;", "clinicas mexicanas de anestesiologia ;", "cronica mexicana de anestesiologia ;", "cronicas mexicana de anestesiologia ;", "cronicas mexicano de anestesiologia ;", "cronicas mexicana en 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: (("cronicas mexicanas de anestesiologia ;") or ("colonias americanas de anestesiologia ;"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("cronicas mexicanas de anestesiologia ;") OR ("colonias americanas de anestesiologia ;")).
• Removing quotes may allow a broader search: (( cronicas mexicanas de anestesiologia ; ) or ( colonias americanas de anestesiologia ; )).
• Adding a wildcard symbol may retrieve word variants: (("cronicas mexicanas de anestesiologia ;") or ("colonias americanas de anestesiologia ;"))*.