Perhaps you should try some spelling variations:
surface expression » surface erosion
information root » information robots, information role, information report
array sharing » arrays bearing, array imaging, way sharing
root surface » flat surface
array string » array strong, arrays strings, array forming
array fermi » array forming, array format

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

• Performing a fuzzy search may retrieve terms with similar spellings: information root surface expression ((((array sharing) OR (array string))) or (array fermi))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information root surface expression ((((array sharing) OR (array string))) OR (array fermi)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "information root surface expression ((((array sharing) OR (array string))) or (array fermi))".
• Adding a wildcard symbol may retrieve word variants: information root surface expression ((((array sharing) OR (array string))) or (array fermi))*.