Perhaps you should try some spelling variations:
"competition management practices theory" » "compensation management practices theory", "cooperation management practices theory", "complication management practices theory", "competition management practice theory", "competition management practical theory", "competition management practices theories"
"objective requirements based history" » "objective measurements based history", "overtime requirements based history", "competitive requirements based history", "objective requirements basic history", "objective requirements case history", "objective requirements race history", "objective requirements bad 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: (("competition management practices theory") OR ("objective requirements based history"))~.
• Removing quotes may allow a broader search: (( competition management practices theory ) or ( objective requirements based history ))~.
• Adding a wildcard symbol may retrieve word variants: (("competition management practices theory") or ("objective requirements based history"))*.