Perhaps you should try some spelling variations:
european conceptual » european concepts, european concept, european concerted
europe conceptual » europe concepts, some conceptual, one conceptual
some concepts » core concepts
history sena » history send, history sense, history set
history self » history siege, history so, history some
history sea » history set, history sec, history sex

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: ((((european conceptual) OR (europe conceptual))) OR (some concepts)) ((history sea) OR (((history sena) OR (history self))))..
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((european conceptual) or (europe conceptual))) or (some concepts)) ((history sea) or (((history sena) OR (history self)))).".
• Adding a wildcard symbol may retrieve word variants: ((((european conceptual) or (europe conceptual))) or (some concepts)) ((history sea) or (((history sena) OR (history self)))).*.