Masking special characters submitting seachr-strings to websources

Some websources (i.e. Spotify) don't accept special characters like german "Umlaute" if they are submitted in a search string.
Amazon does but delivers different results, if you replace an Umlaut or if you don't replace.

Mostly it works if you i.e. change manually an é to an e, ç to c, Ü to u.
But with "German Umlaute" it is not always possible to get results this way.
Is there a way to mask this [Searchby]-string somehow universally to get results?