Perhaps you should try some spelling variations:
petrv » petrov (Expand Search), petro (Expand Search), petra (Expand Search), peterv (Expand Search), perv (Expand Search)
petru » pentru (Expand Search), peteru (Expand Search), petrou (Expand Search), peru (Expand Search)
peterov » petrov (Expand Search)
petroov » petrov (Expand Search), peteroov (Expand Search), petrooov (Expand Search), peroov (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (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 ((((petrv OR petru) OR peruv) OR (peterov OR (petroov OR peroov))) OR (petr OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petrv OR petru) OR peruv) OR (peterov OR (petroov OR peroov))) OR (petr OR petri)) o.s.*".