Perhaps you should try some spelling variations:
"comparative management class history" » "compensation management class history", "comparative management classes history", "comparative management classic history", "comparative management case history", "comparative management crises history"
"competitive procurement references factors" » "competitive procurement reference factors", "competitive measurement references factors", "competitive document references factors"

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