Perhaps you should try some spelling variations:
"practica medica de medicina general ;" » "practica juridica de medicina general ;", "practica clinica de medicina general ;", "practica medida de medicina general ;", "practica media de medicina general ;", "practica medicina de medicina general ;"
"clinicas mexicanas de mediante internet ;" » "clinicas mexicana de mediante internet ;", "clinicas mexicano de mediante internet ;", "clinicas mexicana en mediante internet ;", "clinicas mexicanas adn mediante internet ;", "clinicas mexicanas l.e mediante internet ;", "clinicas mexicanas de mediana internet ;"

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: (("practica medica de medicina general ;") or ("clinicas mexicanas de mediante internet ;"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("practica medica de medicina general ;") OR ("clinicas mexicanas de mediante internet ;")).
• Removing quotes may allow a broader search: (( practica medica de medicina general ; ) or ( clinicas mexicanas de mediante internet ; )).
• Adding a wildcard symbol may retrieve word variants: (("practica medica de medicina general ;") or ("clinicas mexicanas de mediante internet ;"))*.