I don't quite understand where or how you are searching as that makes a difference. Calibre main screen GUI, command line, a program script etc.
Titles in filenames probably won't use Æ etc.
Some background for searching in an eBook.
Æ Œ and similar combinations can either be a ligature (any two letters run together such as fi sometimes) or a single letter, a diagraph, made from two letters. A diagraph is entered as single character in the source text.
Quote:
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In the modern French alphabet, æ (called e-dans-l'a, 'e in the a') is used to spell Latin and Greek borrowings like curriculum vitæ, et cætera, ex æquo, tænia, and the first name Lætitia. It is mentioned in the name of Serge Gainsbourg's song Elaeudanla Téïtéïa, a reading of the French spelling of the name Lætitia: "L, E dans l'A, T, I, T, I, A."
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However ebooks are usually coded in HTML. Most ebooks manage Æ æ Œ œ as characters fine, but the publisher designer may use an HTML entity such as Æ æ Œ or œ
So you may have to search for the actual character or an HTML entity:
https://en.wikipedia.org/wiki/List_o...ity_references