Perhaps you should try some spelling variations:
observational clinical » observation clinical, observational cinema, observational logic
observations clinical » observation clinical, observations critical, observations physical
observational context » observational concepts, observational contacts, observation content
observational clues » observational aspects, observational results, observational techniques

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 clues) OR (((observational clinical) OR (observations clinical))))) OR (observational context)).
• Adding a wildcard symbol may retrieve word variants: ((((observational clues) or (((observational clinical) or (observations clinical))))) or (observational context))*.