Perhaps you should try some spelling variations:
petrv » petrov (Expand Search), petru (Expand Search), petro (Expand Search), petruv (Expand Search)
petrue » petru (Expand Search), petre (Expand Search), petruue (Expand Search), petroue (Expand Search)
petroa » petro (Expand Search), petrov (Expand Search), petra (Expand Search), petruoa (Expand Search), petrooa (Expand Search)
petr » petru (Expand Search), petro (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search)
peteru » petru (Expand Search), peters (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 (petrue OR petroa)) OR per) OR ((petr OR (peteru OR peter)) OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petrv OR (petrue OR petroa)) OR per) OR ((petr OR (peteru OR peter)) OR petri)) o.s.*".