Perhaps you should try some spelling variations:
"competitive requirements peace history" » "competence requirements peace history", "composition requirements peace history", "competitive procurement peace history", "competitive requirements race history", "competitive requirements case history", "competitive requirements part history", "competitive requirements place history", "competitive requirements preface history", "competitive requirements space history"
"comparative management practice theory" » "compensation management practice theory", "comparative management practices theory"

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 practice theory") OR ("competitive requirements peace history"))~.
• Removing quotes may allow a broader search: (( comparative management practice theory ) or ( competitive requirements peace history ))~.
• Adding a wildcard symbol may retrieve word variants: (("comparative management practice theory") or ("competitive requirements peace history"))*.