Perhaps you should try some spelling variations:
peterov » petrov (Expand Search)
petriov » petrov (Expand Search), petriiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petruuiov » pentruuiov (Expand Search), petriuiov (Expand Search), petriuuiov (Expand Search), petrouuiov (Expand Search), peruuiov (Expand Search)
petru » pentru (Expand Search), petri (Expand Search), petriu (Expand Search), petrou (Expand Search), peru (Expand Search)
petroi » petri (Expand Search), petro (Expand Search), petrov (Expand Search), petrioi (Expand Search), petrooi (Expand Search), peroi (Expand Search)
petr » petri (Expand Search), petro (Expand Search), per (Expand Search)

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: fop ((peterov OR (petriov OR petruuiov)) OR ((petru OR petroi) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peterov OR (petriov OR petruuiov)) OR ((petru OR petroi) OR (petr OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peterov OR (petriov OR petruuiov)) OR ((petru OR petroi) OR (petr OR peter))) o.s.*.