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, 12 apache
3.6 apache » 3.6.3 apache, 3.6.4 apache, 3.6.5 apache
3a apache » a apache, _ apache, 1 apache
33 apache » 13 apache, s3 apache, 5.3 apache
3 apache » _ apache, 1 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 (((3.2 apache) OR (3.6 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 (((3.2 apache) OR (3.6 apache))))) or (3 apache)))) software foundation%29%22*".