Perhaps you should try some spelling variations:
estimation detecting » estimation testing, optimization detecting, estimation determining
detecting method » detection method, selecting method, detection methods
method problems » methods problems, method process
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: estimation detecting method problems ((((array string) OR (array format))) OR (array using))~.
• Adding a wildcard symbol may retrieve word variants: estimation detecting method problems ((((array string) or (array format))) or (array using))*.