Perhaps you should try some spelling variations:
28electronic resource » electronic resource, electronic resources, electric resource
3.2 apache » 2.2 apache, 3.2.4 apache, 3 apache
3a apache » 3 apache, a apache, _ apache
33 apache » 3 apache, 13 apache, s3 apache

Try widening your search to All Fields.

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 (3.2 apache))) OR (((33 apache) OR (3.6 apache)))) software foundation%29%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22spark %28electronic resource %((((3a apache) or (3.2 apache))) or (((33 apache) OR (3.6 apache)))) software foundation%29%22".
• Adding a wildcard symbol may retrieve word variants: %22spark %28electronic resource %((((3a apache) or (3.2 apache))) or (((33 apache) OR (3.6 apache)))) software foundation%29%22*.