Perhaps you should try some spelling variations:
knowledge services » knowledge sources
routledge studies » outline studies, route studies
knowledge studies » knowledge sources, knowledge states, knowledge source
knowledge spaces » knowledge sources, knowledge skills

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: ((routledge studies) OR (((((knowledge studies) OR (knowledge spaces))) OR (knowledge services)))) in religion AND politics.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((routledge studies) or (((((knowledge studies) OR (knowledge spaces))) or (knowledge services)))) in religion and politics".
• Adding a wildcard symbol may retrieve word variants: ((routledge studies) or (((((knowledge studies) OR (knowledge spaces))) or (knowledge services)))) in religion and politics*.