Perhaps you should try some spelling variations:
information propagation » information presentation, information organization
propagation a » propagation _
array formats » assay formats, array formulas, ready formats
a extraction » 2 extraction, 3 extraction, 4 extraction
array string » array strong, arrays strings, array sharing

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 a extraction ((((array string) OR (array formats))) OR (array format))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "information propagation a extraction ((((array string) OR (array formats))) OR (array format))".
• Adding a wildcard symbol may retrieve word variants: information propagation a extraction ((((array string) OR (array formats))) OR (array format))*.