Perhaps you should try some spelling variations:
"containing requirements based history" » "conflicting requirements based history", "training requirements based history", "financing requirements based history", "containing requirements basic history", "containing requirements case history", "containing requirements race history", "containing requirements bad 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (("comparative management practice theory") or ("containing requirements based history"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("comparative management practice theory") OR ("containing requirements based history")).
• Removing quotes may allow a broader search: (( comparative management practice theory ) or ( containing requirements based history )).
• Adding a wildcard symbol may retrieve word variants: (("comparative management practice theory") or ("containing requirements based history"))*.