Perhaps you should try some spelling variations:
"comparative management case history" » "compensation management case history", "comparative management trade history", "comparative management state history", "comparative management life history"
"competitive procurement references theory" » "competitive procurement reference theory", "competitive measurement references theory", "competitive document references theory", "competitive procurement references other", "competitive procurement references history", "competitive procurement references thermal"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("comparative management case history") or ("competitive procurement references theory"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("comparative management case history") OR ("competitive procurement references theory")).
• Removing quotes may allow a broader search: (( comparative management case history ) or ( competitive procurement references theory )).
• Adding a wildcard symbol may retrieve word variants: (("comparative management case history") or ("competitive procurement references theory"))*.