Perhaps you should try some spelling variations:
petruov » petrov (Expand Search), peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search)
petriioov » peteriioov (Expand Search), petruiioov (Expand Search), petroiioov (Expand Search)
petriioi » peteriioi (Expand Search), petruiioi (Expand Search), petroiioi (Expand Search)
petroui » peteroui (Expand Search), petruoui (Expand Search), petrooui (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 (((petruov OR petriioov) OR peterdi) OR ((petriioi OR petroui) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruov OR petriioov) OR peterdi) OR ((petriioi OR petroui) OR (petr OR petri))) o.s.*".