Perhaps you should try some spelling variations:
information propagation » information presentation, information organization
propagation system » propagation systems, micropropagation system, propulsion system
array profiling » array processing, microarray profiling
array string » array strong, arrays strings, array sharing
array arcing » array forming, array probing, array sharing
system re » system r, system role, system real

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: information propagation system re ((((array string) OR (array arcing))) OR (array profiling))~.
• Adding a wildcard symbol may retrieve word variants: information propagation system re ((((array string) or (array arcing))) or (array profiling))*.