Special​‍​‌‍​‍‌​‍​‌‍​‍‌ characters are those that become messed up if the converter doesn’t retain the encoding of the original VCF file. Most of the contacts that have been exported from Android or iCloud are using UTF-8, which is not recognized by some tools. So that there is no distortion, users should export VCF contacts to CSV with a converter that is able to keep character encoding. Softaken vCard to CSV Converter is the one that reads the original encoding and creates a clean CSV that is able to support non-English names. Once​‍​‌‍​‍‌​‍​‌‍​‍‌ the transformation is done, it can be another way of solving the problem if users open the file in Google Sheets instead of Excel, as Google Sheets is a tool that automatically recognizes UTF-8. If there are users who still experience the occurrence of broken characters, they can export the CSV from Sheets once more to ensure that the file is properly formatted in all ​‍​‌‍​‍‌​‍​‌‍​‍‌​‍​‌‍​‍‌​‍​‌‍​‍‌programs.
Read more info: https://www.softaken.com/vcf-to-csv-converter