The question mark is provided especially for crossword junkies. Use a question mark for each unknown letter and the reference engine will find all possible words that match. Try entering the surname first, then the first name, such as Hardy, Thomas . These words are known as stop words and can cause problems for some search engines. But at xrefer they are only indexed in headings, so you can search for a dictionary entry on the word and without having to worry about finding every entry which contains the word and .
Capital letters have no effect on searches.
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