You're welcome Mina.
YINDRA in English comes out sounding as JINDRA to Slavic speaking person.
The English Y is a J sound.
More and more adults and children learn or know English but I would suggest a letter in Czech, simple sentences, a photo of your ancestor, your e-mail address sent to the MARICAs in Vlcnov.
I'm sure there is a JINDRA Ancestry and even Genforum board that you might consider posting on. The more boards you post on should bring out some more for your research.http://www.cgsi.org/http://www.csagsi.org/