Perhaps you should try some spelling variations:
28electronic resource » electronic resource, electronic resources, electric resource
3a apache » a apache, 3.2 apache, _ apache
33 apache » s3 apache, 3.2 apache, 5.3 apache
13 apache » 1 apache, 10 apache, 11 apache
3 apache » _ apache, 1 apache, 4 apache

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: %22spark %28electronic resource %((3a apache) OR (((((((33 apache) OR (3.6 apache))) OR (13 apache))) OR (3 apache)))) software foundation%29%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22spark %28electronic resource %((3a apache) or (((((((33 apache) OR (3.6 apache))) or (13 apache))) or (3 apache)))) software foundation%29%22".
• Adding a wildcard symbol may retrieve word variants: %22spark %28electronic resource %((3a apache) or (((((((33 apache) OR (3.6 apache))) or (13 apache))) or (3 apache)))) software foundation%29%22*.