Perhaps you should try some spelling variations:
communication conversion » communication conversation, communications convention, communication cohesion
conversion based » conversion del, conversion a, converter based
based extension » based extraction
extension using » extension united
using spatio » using spatial, using static, using sparse

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication conversion based extension using spatio~.
• Adding a wildcard symbol may retrieve word variants: communication conversion based extension using spatio*.