Perhaps you should try some spelling variations:
information diffraction » information extraction, information diffusion, information interaction
diffraction methods » extraction methods
array formulas » area formulas, harrop formulas, array formats
methods soft » methods short, methods sefm, methods safety
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 diffraction methods soft ((((array formulas) or (array format))) or (array string))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information diffraction methods soft ((((array formulas) OR (array format))) OR (array string)).
• Adding a wildcard symbol may retrieve word variants: information diffraction methods soft ((((array formulas) or (array format))) or (array string))*.