Perhaps you should try some spelling variations:
"digital presentation -- handbooks, manuals, etc." » "digital preservation -- handbooks, manuals, etc."
"digital cooperation -- handbooks, manuals, etc." » "regional cooperation -- handbooks, manuals, etc.", "military cooperation -- handbooks, manuals, etc.", "legal cooperation -- handbooks, manuals, etc."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("digital cooperation -- handbooks, manuals, etc.") or ("digital presentation -- handbooks, manuals, etc."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("digital cooperation -- handbooks, manuals, etc.") OR ("digital presentation -- handbooks, manuals, etc.")).
• Removing quotes may allow a broader search: (( digital cooperation -- handbooks, manuals, etc. ) or ( digital presentation -- handbooks, manuals, etc. )).
• Adding a wildcard symbol may retrieve word variants: (("digital cooperation -- handbooks, manuals, etc.") or ("digital presentation -- handbooks, manuals, etc."))*.

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