Perhaps you should try some spelling variations:
information robots » information problems, information problem, information report
surface expression » surface erosion
robots surface » rabbits surface, riblets surface, foods surface
array formulas » area formulas, harrop formulas, array format
array forming » array format, array arcing, array fermi
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 robots surface expression ((array string) or (((array formulas) or (array forming))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information robots surface expression ((array string) OR (((array formulas) OR (array forming)))).
• Adding a wildcard symbol may retrieve word variants: information robots surface expression ((array string) or (((array formulas) or (array forming))))*.