Perhaps you should try some spelling variations:
"1944 Icelandic institucional referendum" » "1944 Icelandic institucional frente", "1944 Icelandic institucional regreso"
"1944 Icelandic constitutional referendum" » "1944 Icelandic constitucional referendum", "1944 Icelandic institutional referendum", "1944 Icelandic constitution referendum"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"1944 Icelandic constitutional referendum\") OR (\"1944 Icelandic institucional referendum\"))~".
• Removing quotes may allow a broader search: (( 1944 Icelandic constitutional referendum ) OR ( 1944 Icelandic institucional referendum ))~.
• Adding a wildcard symbol may retrieve word variants: (("1944 Icelandic constitutional referendum") OR ("1944 Icelandic institucional referendum"))*.