Perhaps you should try some spelling variations:
petroiiv » petrov (Expand Search), peteroiiv (Expand Search), petrioiiv (Expand Search), petruoiiv (Expand Search)
peru » petru (Expand Search), per (Expand Search)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (Expand Search)
petriiiv » peteriiiv (Expand Search), petriiiiv (Expand Search), petruiiiv (Expand Search)
petrou » peterou (Expand Search), petriou (Expand Search), petruou (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 (((petriiv OR petroiiv) OR petriiiv) OR ((((pero OR perio) OR petrou) OR peru) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriiv OR petroiiv) OR petriiiv) OR ((((pero OR perio) OR petrou) OR peru) OR petr)) o.s.*".