Perhaps you should try some spelling variations:
"microscopia electronica sosa garcia" » "microscopia electronica s.a garcia", "microscopia electronica los garcia", "microscopia electronica sobre garcia", "microscopia electronica costa garcia", "microscopia electronica mora garcia", "microscopia electronica roa garcia"
"microscopia electronica diaz garcia" » "microscopia electronica del garcia", "microscopia electronica s.a garcia", "microscopia electronica a garcia"
"microscopia electronica de garrido" » "microscopia electronico de garrido", "microscopia electronica de barrido", "microscopia electronica p garrido", "microscopia electronica diaz garrido"

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