Perhaps you should try some spelling variations:
"microscopia electronica diaz garrido" » "microscopia electronica de garrido", "microscopia electronica s.a garrido", "microscopia electronica a garrido", "microscopia electronica diaz carrillo", "microscopia electronica diaz barreiro", "microscopia electronica diaz garcia"
"microscopia electronica del carrillo" » "microscopia electronicas del carrillo", "microscopia electronica de carrillo", "microscopia electronico del carrillo", "microscopia electronica del cigarrillo", "microscopia electronica del chorrillo", "microscopia electronica del castillo"

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: (("microscopia electronica diaz garrido") or ("microscopia electronica del carrillo"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("microscopia electronica diaz garrido") OR ("microscopia electronica del carrillo")).
• Removing quotes may allow a broader search: (( microscopia electronica diaz garrido ) or ( microscopia electronica del carrillo )).
• Adding a wildcard symbol may retrieve word variants: (("microscopia electronica diaz garrido") or ("microscopia electronica del carrillo"))*.