Perhaps you should try some spelling variations:
"competitive requirements based history" » "competence requirements based history", "composition requirements based history", "competitive procurement based history", "competitive requirements basic history", "competitive requirements case history", "competitive requirements race history", "competitive requirements bad history"
"conjunctive management study history" » "comparative management study history", "conjunctive management story history", "conjunctive management studies history", "conjunctive management italy history"

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: (("conjunctive management study history") OR ("competitive requirements based history"))~.
• Removing quotes may allow a broader search: (( conjunctive management study history ) or ( competitive requirements based history ))~.
• Adding a wildcard symbol may retrieve word variants: (("conjunctive management study history") or ("competitive requirements based history"))*.