Perhaps you should try some spelling variations:
communities normalization » communities formalization, communities organization, communities organizations
normalization based » formalization based, localization based, organization based
based extension » based extraction
array string » array strong, arrays strings, array sharing
array using » arrays using

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "communities normalization based extension ((array string) OR (((array using) OR (array format))))~".
• Adding a wildcard symbol may retrieve word variants: communities normalization based extension ((array string) OR (((array using) OR (array format))))*.