Perhaps you should try some spelling variations:
petroov » petrov (Expand Search), petrioov (Expand Search), petruoov (Expand Search), petrooov (Expand Search)
petre » petri (Expand Search), petru (Expand Search), petro (Expand Search), petrie (Expand Search), petrue (Expand Search), petroe (Expand Search)
petrou » petru (Expand Search), petro (Expand Search), petrov (Expand Search), petriou (Expand Search), petruou (Expand Search), petroou (Expand Search)
petrioi » petriioi (Expand Search), petruioi (Expand Search), petroioi (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 ((petroov OR (petre OR petrou)) OR ((petrioi 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 (petre OR petrou)) OR ((petrioi OR petrioi) OR ((petr OR per) OR peter))) o.s.*".