Perhaps you should try some spelling variations:
information requirements » nutrition requirements, irrigation requirements, information environments
requirements cda » requirements a, requirements c.w, requirements can
cda extensions » c extensions, csp extensions, rna extensions
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: information requirements cda extensions ((array string) or (((array arcing) or (array format))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information requirements cda extensions ((array string) OR (((array arcing) OR (array format)))).
• Adding a wildcard symbol may retrieve word variants: information requirements cda extensions ((array string) or (((array arcing) or (array format))))*.