Perhaps you should try some spelling variations:
petroov » petrov (Expand Search), petrioov (Expand Search), petrooov (Expand Search)
petrie » petri (Expand Search), petris (Expand Search), patrie (Expand Search), petriie (Expand Search), petroie (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)
petrioi » petriioi (Expand Search), petroioi (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 (petrie OR petru)) OR ((petroi OR petrioi) OR ((petr OR per) OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petroov OR (petrie OR petru)) OR ((petroi OR petrioi) OR ((petr OR per) OR peter))) o.s.*".