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

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"1944 Icelandic constitutional referendum\") OR (\"1944 Icelandic institutional referendum\"))~".
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