Perhaps you should try some spelling variations:
communication documentation » communication foundation, communication communication, communication conversation
documentation base » documentation based, documentation basic, documentation fast
extension area » extension agent, extension a, extension agents
extension key » extension apex, extension _, extension a

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: communication documentation base ((extension key) OR (extension area)) lime~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "communication documentation base ((extension key) OR (extension area)) lime".
• Adding a wildcard symbol may retrieve word variants: communication documentation base ((extension key) OR (extension area)) lime*.