Perhaps you should try some spelling variations:
observational clinical » observation clinical, observations clinical, observational logic
observational context » observational concepts, observational contacts, observation content
observational cinema » observational economy, observational clues, observational case
observational coding » observational long, observational point, observational rating
observational cohort » observational support, observational errors, observational methods

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