Perhaps you should try some spelling variations:
"teachers associations in economic theory." » "teacher associations in economic theory.", "farmers associations in economic theory.", "trade associations in economic theory."
"teacher association in economic theory." » "teacher associations in economic theory.", "trade association in economic theory.", "water association in economic theory."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("routledge explorations in economic theory.") or ((((("teachers associations in economic theory.") OR ("teacher association in economic theory."))) or ("teacher evaluations in economic theory."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("routledge explorations in economic theory.") OR ((((("teachers associations in economic theory.") OR ("teacher association in economic theory."))) OR ("teacher evaluations in economic theory.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"routledge explorations in economic theory.\") or (((((\"teachers associations in economic theory.\") OR (\"teacher association in economic theory.\"))) or (\"teacher evaluations in economic theory.\"))))".
• Removing quotes may allow a broader search: (( routledge explorations in economic theory. ) or ((((( teachers associations in economic theory. ) OR ( teacher association in economic theory. ))) or ( teacher evaluations in economic theory. )))).
• Adding a wildcard symbol may retrieve word variants: (("routledge explorations in economic theory.") or ((((("teachers associations in economic theory.") OR ("teacher association in economic theory."))) or ("teacher evaluations in economic theory."))))*.