Perhaps you should try some spelling variations:
28electronic resource » electronic resource, electronic resources, electronic sources
electric resource » electronic resource, electric source, electronic resources
3.6 apache » 3.6.3 apache, 3.6.4 apache, 3.6.5 apache
3.2 apache » 2.2 apache, 3.2.4 apache, 3 apache
33 apache » 3 apache, 13 apache, s3 apache

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

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