Perhaps you should try some spelling variations:
span extension » urban extension, domain extension
information a » information age
array string » array strong, arrays strings, array sharing
array using » arrays using
array fermi » array forming, array format
a span » a spawn, _ span, a spin

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

• Performing a fuzzy search may retrieve terms with similar spellings: information a span extension ((((array string) or (array using))) or (array fermi))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information a span extension ((((array string) OR (array using))) OR (array fermi)).
• Adding a wildcard symbol may retrieve word variants: information a span extension ((((array string) or (array using))) or (array fermi))*.