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 practices historical" » "compensation management practices historical", "comparative management practices editorial", "comparative management states historical", "comparative management practice 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 historical") OR ("competitive requirements case history"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"comparative management practices historical\") OR (\"competitive requirements case history\"))*".
• Removing quotes may allow a broader search: (( comparative management practices historical ) OR ( competitive requirements case history ))*.