Perhaps you should try some spelling variations:
recreation examination » restriction examination, education examination, recreation evaluation
examination methods » examination questions
array formulas » area formulas, harrop formulas, array format
array string » array strong, arrays strings, array sharing
array arcing » array forming, array probing, 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: recreation examination methods tools ((((array string) or (array formulas))) or (array arcing))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: recreation examination methods tools ((((array string) OR (array formulas))) OR (array arcing)).
• Adding a wildcard symbol may retrieve word variants: recreation examination methods tools ((((array string) or (array formulas))) or (array arcing))*.