Perhaps you should try some spelling variations:
petroov » petrov (Expand Search), petruoov (Expand Search), petrooov (Expand Search), peroov (Expand Search)
petrow » petro (Expand Search), petrov (Expand Search), petrowna (Expand Search), petruow (Expand Search), petroow (Expand Search), perow (Expand Search)
petrou » petru (Expand Search), petro (Expand Search), petrov (Expand Search), petruou (Expand Search), petroou (Expand Search), perou (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search), peri (Expand Search)
petrooi » petruooi (Expand Search), petroooi (Expand Search), perooi (Expand Search)
petriou » petruiou (Expand Search), petroiou (Expand Search), periou (Expand Search)
petr » petru (Expand Search), petro (Expand Search), per (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 (petri OR (petrow OR petrooi))) OR ((petrou OR petriou) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petroov OR (petri OR (petrow OR petrooi))) OR ((petrou OR petriou) OR (petr OR peter))) o.s.*".