Perhaps you should try some spelling variations:
knowledge technology » knowledge sociology
knowledge economic » knowledge economies
knowledge ecology » knowledge sociology, knowledge ecologies, knowledge ontology

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: %((((((knowledge ecology) OR (knowledge technology))) OR (knowledge economic))) OR (knowledge economy))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((((knowledge ecology) OR (knowledge technology))) or (knowledge economic))) or (knowledge economy))%22".
• Adding a wildcard symbol may retrieve word variants: %((((((knowledge ecology) OR (knowledge technology))) or (knowledge economic))) or (knowledge economy))%22*.