Perhaps you should try some spelling variations:
introduction discretization » reduction discretization, introduction description, introduction distribution
methods risks » methods risk, method risk, methods russ
array string » array strong, arrays strings, array sharing
array arcing » array forming, array probing, array sharing
array using » arrays using

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

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