Perhaps you should try some spelling variations:
observational concerns » observational concepts, observational constrains, observational contrains
observational contacts » observational contrains, observational concepts, observational constraints
observational context » observational concepts, observation content, observationsin contexts
observational cinema » observational clinical, observational economy, observational clues
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 context) OR (observational contacts))) OR (((operational concepts) OR (observational concerns)))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((observational cinema) or (((((observational context) OR (observational contacts))) or (((operational concepts) or (observational concerns))))))".
• Adding a wildcard symbol may retrieve word variants: ((observational cinema) or (((((observational context) OR (observational contacts))) or (((operational concepts) or (observational concerns))))))*.