Perhaps you should try some spelling variations:
"competitive requirements case history" » "competence requirements case history", "composition requirements case history", "competitive procurement case history", "competitive requirements based history", "competitive requirements core history", "competitive requirements race history", "competitive requirements trade history", "competitive requirements state history", "competitive requirements life history"
"comparative management future history" » "compensation management future history", "comparative management culture history", "comparative management figure history", "comparative management features history", "comparative management future story", "comparative management nature 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 future history") OR ("competitive requirements case history"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"comparative management future history\") OR (\"competitive requirements case history\"))*".
• Removing quotes may allow a broader search: (( comparative management future history ) OR ( competitive requirements case history ))*.