Perhaps you should try some spelling variations:
petr » petri (Expand Search), petru (Expand Search), petro (Expand Search)
petruou » petriuou (Expand Search), petruuou (Expand Search), petrouou (Expand Search)
petroou » petrioou (Expand Search), petruoou (Expand Search), petrooou (Expand Search)
petruoou » petriuoou (Expand Search), petruuoou (Expand Search), petrouoou (Expand Search)
petrov » petriov (Expand Search), petruov (Expand Search), petroov (Expand Search), petro (Expand Search)
petriov » petriiov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petr OR peter) OR (petruou OR ((petroou OR petruoou) OR (petrov OR petriov)))) _. s.~".
• Adding a wildcard symbol may retrieve word variants: fop ((petr OR peter) OR (petruou OR ((petroou OR petruoou) OR (petrov OR petriov)))) _. s.*.