Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), peteriov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petrouo » peterouo (Expand Search), petruouo (Expand Search), petroouo (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
peteru » peter (Expand Search), petru (Expand Search), peters (Expand Search)
peteruo » petero (Expand Search), petruo (Expand Search), peterso (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 peteru) OR (petrouo OR peteruo)) OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriov OR (((petr OR peteru) OR (petrouo OR peteruo)) OR petri)) o.s.*".