Perhaps you should try some spelling variations:
"unified variational / security council" » "mixed variational / security council", "field variational / security council"
"unified national / security council" » "unified spatial / security council"
"united national / security council" » "united nations / security council", "united nation's / security council", "united nation / security council"

Try widening your search to All Fields.

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: (("united national / security council") OR ((("unified national / security council") OR ("unified variational / security council")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"united national / security council\") or (((\"unified national / security council\") OR (\"unified variational / security council\"))))".
• Removing quotes may allow a broader search: (( united national / security council ) or ((( unified national / security council ) OR ( unified variational / security council )))).
• Adding a wildcard symbol may retrieve word variants: (("united national / security council") or ((("unified national / security council") OR ("unified variational / security council"))))*.