Perhaps you should try some spelling variations:
"cronicas alemanas de medicina interna ;" » "cronicas americanas de medicina interna ;", "cronicas argelinas de medicina interna ;", "cronicas italianas de medicina interna ;", "cronicas alemana de medicina interna ;", "cronicas alemania de medicina interna ;", "cronicas alemana del medicina interna ;"
"cronica mexicana de medicina general ;" » "botanica mexicana de medicina general ;", "prensa mexicana de medicina general ;"

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 alemanas de medicina interna ;") OR ("cronica mexicana de medicina general ;"))~.
• Removing quotes may allow a broader search: (( cronicas alemanas de medicina interna ; ) or ( cronica mexicana de medicina general ; ))~.
• Adding a wildcard symbol may retrieve word variants: (("cronicas alemanas de medicina interna ;") or ("cronica mexicana de medicina general ;"))*.