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 history" » "competitive procurement reference history", "competitive measurement references history", "competitive document references history", "competitive procurement references list", "competitive procurement references factors", "competitive procurement references theory"

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