Re: Ethel Olga Andersen
You have no birthdate?or even a birth year?
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The most recent Norwegian census made public is the 1910 census.That is available online for your research.
I checked very quickly and without trying to think of any spelling variations that might have been used and didn't find anyone in the 1910 census who used the surname 'Vincent'.
There is no nationwide index of births in Norway.
Perhaps you will find some little piece of data somewhere in the non-Norway records that might point you to the right part of Norway.