Perhaps you should try some spelling variations:
"comparative management practices history" » "compensation management practices history", "comparative management practice history", "comparative management prices history", "comparative management practices historical"
"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.

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