Perhaps you should try some spelling variations:
information estimation » deformation estimation, information motivation, information extraction
estimation methods » optimization methods, examination methods, evaluation methods
array forming » array arcing, array fermi, array formats
methods rome » methods role, methods some, methods roger
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 estimation methods rome ((((array forming) or (array format))) or (array string))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information estimation methods rome ((((array forming) OR (array format))) OR (array string)).
• Adding a wildcard symbol may retrieve word variants: information estimation methods rome ((((array forming) or (array format))) or (array string))*.