Perhaps you should try some spelling variations:
peterov » petrov (Expand Search)
petroiv » petrov (Expand Search), petrioiv (Expand Search), petruoiv (Expand Search), petrooiv (Expand Search)
petrio » petri (Expand Search), petris (Expand Search), petro (Expand Search), petriio (Expand Search), petruio (Expand Search), petroio (Expand Search)
petruio » petriuio (Expand Search), petruuio (Expand Search), petrouio (Expand Search)
petruuio » petriuuio (Expand Search), petruuuio (Expand Search), petrouuio (Expand Search)
petr » petri (Expand Search), petru (Expand Search), petro (Expand Search)

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 petroiv) OR ((petrio OR (petruio OR petruuio)) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peterov OR petroiv) OR ((petrio OR (petruio OR petruuio)) OR (petr OR peter))) o.s.*".