TOVISKA has already been mentioned at Mudcat here. It is listed in the table of contents of a book called "The Bridge of Song" (Delaware, Ohio: Cooperative Recreation Service, Inc., 1957)—as well as the "Sangam GIT" songbook that Joe already mentioned.

A search in Google Books for "toviska moravia" brings up 2 more books:

Music for Young Americans, Vol. 6: Studying Music by Richard C. Berg et al. ([New York]: American Book Co. [1966-])

The American Singer, Vol. 7 by John Walter Beattie and William Charles Bridgman (New York: American Book, 1950).

I even did some browsing in the Czech version of Wikipedia. All I could find was some references to people named Tobiška, for example, here: http://cs.wikipedia.org/wiki/Bohuslav_Tobi%C5%A1ka

It seems absurd that, if Toviska is a real place, we can't find it in any gazetteer.