Perhaps you should try some spelling variations:
petr » petro (Expand Search), per (Expand Search)
petruoi » petrouoi (Expand Search), peruoi (Expand Search), pentruoi (Expand Search)
petru » petrou (Expand Search), peru (Expand Search), pentru (Expand Search)
petroiv » petrooiv (Expand Search), peroiv (Expand Search), petrov (Expand Search)
petris » petrois (Expand Search), peris (Expand Search)
petri » petroi (Expand Search), peri (Expand Search)
petrois » petroois (Expand Search), perois (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 ((petr OR peter) OR ((petruoi OR petru) OR (petroiv OR ((petris OR petri) OR petrois)))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petr OR peter) OR ((petruoi OR petru) OR (petroiv OR ((petris OR petri) OR petrois)))) o.s.*".