Perhaps you should try some spelling variations:
communication documentation » communication foundation, communication communication, communication conversation
documentation based » documentation fast, documentation a, documentation center
based extension » based extraction
extension key » extension area, extension apex, extension _
key like » key lime, key life, stey like

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 based extension key like~.
• Adding a wildcard symbol may retrieve word variants: communication documentation based extension key like*.