Hah, apparently the word I was looking for is serf, not vassal. They had to work for their lord (mostly for free), were not allowed to move away, they had to ask for permission if they wanted to marry someone from another manor and so on. Most people were serfs.
The surname seems like Agzmon to me, which could be the surname you´re looking for, scribes had often that "write down what you hear" approach in those times. Here http://actapublica.eu/matriky/plzen/prohlizec/1235/?strana=3...
is a birth of a daughter of Josephus Hayžmon and Catharina in 1773. They´re from Lišice and there´s another name that connects them - groomsman from the wedding and a godparent were both children of Laurentius Hrubý from Kraschawitz (now Krasavce).
Maybe Catharina died and Josephus married Rosina? Find all children of Josephus and Rosina, maybe there will be more information in later records. And look for Catharina´s death record.