Perhaps you should try some spelling variations:
agricultural subsidies » agricultural policies
agricultural studies » agricultural sources, multicultural studies, agricultural services
agricultural species » horticultural species, agricultural aspects, agricultural space

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: %((((structural studies) OR (cultural studies))) OR (((((agricultural studies) OR (agricultural species))) OR (agricultural subsidies)))) AND transdisciplinarity in education%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((structural studies) or (cultural studies))) or (((((agricultural studies) OR (agricultural species))) or (agricultural subsidies)))) and transdisciplinarity in education%22".
• Adding a wildcard symbol may retrieve word variants: %((((structural studies) or (cultural studies))) or (((((agricultural studies) OR (agricultural species))) or (agricultural subsidies)))) and transdisciplinarity in education%22*.