Perhaps you should try some spelling variations:
"cronicas americanas de medicina interna ;" » "colonias americanas de medicina interna ;", "chicas americanas de medicina interna ;", "cronicas alemanas de medicina interna ;", "cronicas americanas del medicina interna ;", "cronicas americana de medicina interna ;", "cronicas americanos de medicina interna ;"
"cronica mexicana de medicina moderna ;" » "botanica mexicana de medicina moderna ;", "prensa mexicana de medicina moderna ;", "cronica mexicana de medicina medicina ;"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("cronicas americanas de medicina interna ;") OR ("cronica mexicana de medicina moderna ;"))~.
• Removing quotes may allow a broader search: (( cronicas americanas de medicina interna ; ) or ( cronica mexicana de medicina moderna ; ))~.
• Adding a wildcard symbol may retrieve word variants: (("cronicas americanas de medicina interna ;") or ("cronica mexicana de medicina moderna ;"))*.