Perhaps you should try some spelling variations:
petr » peter (Expand Search), petro (Expand Search), per (Expand Search)
petroi » peteroi (Expand Search), petrooi (Expand Search), peroi (Expand Search), petro (Expand Search), petrov (Expand Search), petrow (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (Expand Search), pentru (Expand Search)
petruoi » peteruoi (Expand Search), petrouoi (Expand Search), peruoi (Expand Search), pentruoi (Expand Search)
peterov » petrov (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 ((petroi OR (petri OR petru)) OR petruoi)) OR peterov) _. s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petr OR ((petroi OR (petri OR petru)) OR petruoi)) OR peterov) _. s.*".