Perhaps you should try some spelling variations:
petrov » petro (Expand Search), peterov (Expand Search), petriov (Expand Search), petruov (Expand Search)
petruiv » peteruiv (Expand Search), petriuiv (Expand Search), petruuiv (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petroiuo » peteroiuo (Expand Search), petrioiuo (Expand Search), petruoiuo (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
peteri » peter (Expand Search), petri (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 ((petrov OR petruiv) OR ((petruov OR petroiuo) OR (petr OR (peteri OR peterdi)))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrov OR petruiv) OR ((petruov OR petroiuo) OR (petr OR (peteri OR peterdi)))) o.s.*".