Perhaps you should try some spelling variations:
"comparative management practices material" » "compensation management practices material", "comparative management practices materials", "comparative management practices editorial", "comparative management practices matter"
"competitive procurement peace history" » "competitive procurement prices history", "competitive procurement plans history", "competitive procurement plan history", "competitive procurement place history", "competitive procurement preface history", "competitive procurement space history"

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 practices material") OR ("competitive procurement peace history"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"comparative management practices material\") OR (\"competitive procurement peace history\"))*".
• Removing quotes may allow a broader search: (( comparative management practices material ) OR ( competitive procurement peace history ))*.