Perhaps you should try some spelling variations:
coleccion calderon » coleccion cadernos, coleccion cuadernos, colon calderon
calderon virtual » calderon victor, calderon marta, calderon martha
espiritu del » espiritu de
90 espiritu » 120 espiritu, el espiritu, y espiritu
virtual de » virtuales de
del caso » el caso, del campo

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( coleccion 90 espiritu del caso ) or ( coleccion calderon virtual de clacso ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( coleccion 90 espiritu del caso ) OR ( coleccion calderon virtual de clacso )).
• Adding a wildcard symbol may retrieve word variants: (( coleccion 90 espiritu del caso ) or ( coleccion calderon virtual de clacso ))*.