Perhaps you should try some spelling variations:
observational conceptual » observation conceptual, conservation conceptual, observation concept
observational concepts » observation concepts, observational concerns, observation concept
observational cinema » observational clinical, observational context, observational economy
operational concepts » computational concepts, foundational concepts, relational concept

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: ((observational cinema) OR (((((observational concepts) OR (operational concepts))) OR (observational conceptual)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((observational cinema) or (((((observational concepts) OR (operational concepts))) or (observational conceptual))))".
• Adding a wildcard symbol may retrieve word variants: ((observational cinema) or (((((observational concepts) OR (operational concepts))) or (observational conceptual))))*.