Perhaps you should try some spelling variations:
observational concepts » observational concerns, observational conceptual, operational concepts
observational contacts » observational contrains, observational context, observational constraints
observational cinema » observational clinical, observational context, observational economy
observation concepts » observation concept, conservation concepts, obervations concepts

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