Perhaps you should try some spelling variations:
observational conceptual » observation conceptual, conservation conceptual, observation concept
observational concepts » observation concepts, observational concerns, operational concepts
observational context » observational contacts, observationsin contexts, observational concerns
observational clues » observational aspects, observational results, observational techniques
observation content » observation concept, observation consistent, observation 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 clues) OR (((observation content) OR (((observational context) OR (((observational concepts) OR (observational conceptual)))))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((observational clues) or (((observation content) or (((observational context) or (((observational concepts) OR (observational conceptual))))))))".
• Adding a wildcard symbol may retrieve word variants: ((observational clues) or (((observation content) or (((observational context) or (((observational concepts) OR (observational conceptual))))))))*.