Why do search terms with special characters return 0 results?

If your search term contains a non-alphanumeric character, such as symbols like “%”, then that character will be treated as a blank space. For example, "2%" becomes "2".

Non-standard alphabetical characters, such as “é”, will be treated as their standard counterpart. For example, "résumé" becomes "resume".

These apply to Search, Synonyms, and Autosuggest.