Perhaps you should try some spelling variations:
observational cinema » observational clinical, observational context, observational economy
observational cohort » observational support, observational errors, observational method
observation content » observation consistent, observational context, observation concepts
observation concept » observation concepts, conservation concept, observation conceptual

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