Perhaps you should try some spelling variations:
information propagation » information presentation, information organization
propagation based » propagation case, propagation a, propagation due
based extension » based extraction
david siders » david silver's, david peters, david rogers
david side » david simple, david siegel, david silver
david sims » david simon, david simmons, david simpson

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

• Performing a fuzzy search may retrieve terms with similar spellings: information propagation based extension ((((david side) or (david sims))) or (david siders))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information propagation based extension ((((david side) OR (david sims))) OR (david siders)).
• Adding a wildcard symbol may retrieve word variants: information propagation based extension ((((david side) or (david sims))) or (david siders))*.