Perhaps you should try some spelling variations:
petroov » petrov (Expand Search), petrioov (Expand Search), petrooov (Expand Search)
petre » petri (Expand Search), petro (Expand Search), petra (Expand Search), petrie (Expand Search), petroe (Expand Search)
petru » pentru (Expand Search), petri (Expand Search), petriu (Expand Search), petrou (Expand Search)
petroi » petri (Expand Search), petro (Expand Search), petrov (Expand Search), petrioi (Expand Search), petrooi (Expand Search)
petriioi » petriiioi (Expand Search), petroiioi (Expand Search)
petr » petri (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 ((petroov OR (petre OR petru)) OR ((petroi OR petriioi) OR ((petr OR per) OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petroov OR (petre OR petru)) OR ((petroi OR petriioi) OR ((petr OR per) OR peter))) o.s.*".