Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petroui » peteroui (Expand Search), petrioui (Expand Search), petruoui (Expand Search)
petruo » peteruo (Expand Search), petriuo (Expand Search), petruuo (Expand Search), petru (Expand Search), petro (Expand Search)
petrouo » peterouo (Expand Search), petriouo (Expand Search), petruouo (Expand Search)
peteri » peterdi (Expand Search), peter (Expand Search), petri (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 (petriov OR (((petr OR petroui) OR (petruo OR petrouo)) OR (peteri OR peteri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriov OR (((petr OR petroui) OR (petruo OR petrouo)) OR (peteri OR peteri))) o.s.*".