Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petriiov (Expand Search), petroiov (Expand Search)
petroiov » peteroiov (Expand Search), petrioiov (Expand Search), petrooiov (Expand Search)
petrov » peterov (Expand Search), petriov (Expand Search), petroov (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petruo » peteruo (Expand Search), petriuo (Expand Search), petrouo (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petro (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 petroiov) OR (petrov OR peterov)) OR (((pero OR petru) OR petruo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriov OR petroiov) OR (petrov OR peterov)) OR (((pero OR petru) OR petruo) OR petr)) o.s.*".