* The name is misspelled: Double-check the spelling.
* The author used a different name: Check for variations in the spelling or other names the author may have used.
* The author is not well-known: If the author is relatively unknown, their work may not be widely documented online.
* The author's work is unpublished: The author may have written but not published their work.
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* More information about the work: What kind of book are you looking for? Genre, subject matter, any specific details about the story?
* Any other details you know about the author: Do you have any other information about Olive K Neilson, like a city or country of origin, or a time period they might have lived in?
With more information, I might be able to help you find the author you are looking for.