Perhaps you should try some spelling variations:
"1944 Icelandic constitutional referendum" » "1944 Icelandic constitution referendum", "1944 Icelandic institucional referendum", "1944 Icelandic constitucion referendum"
"1944 Icelandic constitucionales referendum" » "1944 Icelandic institucionales referendum", "1944 Icelandic institucional referendum", "1944 Icelandic instituciones referendum"
"1944 Icelandic institutional referendum" » "1944 Icelandic institucional referendum", "1944 Icelandic institucionales referendum", "1944 Icelandic instituciones referendum"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("1944 Icelandic constitutional referendum") OR ("1944 Icelandic constitucionales referendum"))) OR ((("1944 Icelandic institutional referendum") OR ("1944 Icelandic constitucional referendum"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"1944 Icelandic constitutional referendum\") OR (\"1944 Icelandic constitucionales referendum\"))) OR (((\"1944 Icelandic institutional referendum\") OR (\"1944 Icelandic constitucional referendum\"))))".
• Removing quotes may allow a broader search: (((( 1944 Icelandic constitutional referendum ) OR ( 1944 Icelandic constitucionales referendum ))) OR ((( 1944 Icelandic institutional referendum ) OR ( 1944 Icelandic constitucional referendum )))).
• Adding a wildcard symbol may retrieve word variants: (((("1944 Icelandic constitutional referendum") OR ("1944 Icelandic constitucionales referendum"))) OR ((("1944 Icelandic institutional referendum") OR ("1944 Icelandic constitucional referendum"))))*.