Perhaps you should try some spelling variations:
knowledge technology » knowledge sociology
knowledge economic » knowledge economies
knowledge ecology » knowledge sociology, knowledge ecologies, knowledge ontology
knowlege economy » knowledge economy's, knolwedge economy, knowledge economies

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: %((((((knowlege economy) OR (((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: "%((((((knowlege economy) or (((knowledge ecology) OR (knowledge technology))))) or (knowledge economic))) or (knowledge economy))%22".
• Adding a wildcard symbol may retrieve word variants: %((((((knowlege economy) or (((knowledge ecology) OR (knowledge technology))))) or (knowledge economic))) or (knowledge economy))%22*.