Perhaps you should try some spelling variations:
peteroiv » petrov (Expand Search), peterdi (Expand Search)
periv » petriv (Expand Search), perv (Expand Search)
peri » petri (Expand Search), per (Expand Search)
petriv » peteriv (Expand Search), petriiv (Expand Search), petruiv (Expand Search)
petriu » peteriu (Expand Search), petriiu (Expand Search), petruiu (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (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 (((petriv OR peteroiv) OR periv) OR (((petriu OR peri) OR petrui) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriv OR peteroiv) OR periv) OR (((petriu OR peri) OR petrui) OR petr)) o.s.*".