Perhaps you should try some spelling variations:
"khan official" » "blank official", "non official", "a official"
"open official" » "openai official", "den official", "upon official"
"ex official" » "e official", "den official", "_ official"

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: (("ex officio") OR ((("ex official") OR ((("khan official") OR ("open official")))))).
• Removing quotes may allow a broader search: (( ex officio ) or ((( ex official ) or ((( khan official ) or ( open official )))))).
• Adding a wildcard symbol may retrieve word variants: (("ex officio") or ((("ex official") or ((("khan official") or ("open official"))))))*.