Browse searches are not case-sensitive, but you need to include all regular characters and punctuation as they are in the record or replace them with a space. For a symbol you would search for a/76/1 or a 76 1 for example. To browse by issuing body/series symbol (for example to find all documents issued under a session), use the "body" field and enter a space between the values that would be in $b and $c, for example "E/ 59".
You do NOT need to include diacritics or other special characters, they are automatically included in the search:
If you’re used to doing alphabetical searches in Horizon, you will notice that the numerical sequence in the MARC Editor is correct – compare the result for a symbol search for A/76/27 in the MARC Editor vs. Horizon:
