Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petruiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petero » peters (Expand Search), petro (Expand Search)
petruiiiov » petruuiiiov (Expand Search), petrouiiiov (Expand Search), peruiiiov (Expand Search)
petris » petruis (Expand Search), petrois (Expand Search), peris (Expand Search)
petr » petru (Expand Search), petro (Expand Search), per (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search), peri (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 petruiiiov) OR petris) OR (((petero OR peter) OR petr) OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriov OR petruiiiov) OR petris) OR (((petero OR peter) OR petr) OR petri)) o.s.*".