Perhaps you should try some spelling variations:
"observational context" » "observational concepts", "observational contacts", "observation content"
"observational comedy" » "observational economy", "observational cohort", "observational model"
"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 comedy") OR ("observational clues"))) OR ("observational context")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"observational comedy\") OR (\"observational clues\"))) or (\"observational context\"))".
• Removing quotes may allow a broader search: (((( observational comedy ) OR ( observational clues ))) or ( observational context )).
• Adding a wildcard symbol may retrieve word variants: (((("observational comedy") OR ("observational clues"))) or ("observational context"))*.