Perhaps you should try some spelling variations:
peteroiv » petrov (Expand Search), peterdi (Expand Search)
periiv » petriiv (Expand Search), periv (Expand Search)
peri » petri (Expand Search), per (Expand Search)
petruv » peteruv (Expand Search), petriuv (Expand Search), petrouv (Expand Search)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petroiiv (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (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 ((petruv OR (peteroiv OR (petriiv OR periiv))) OR (((peri OR petru) OR peteri) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruv OR (peteroiv OR (petriiv OR periiv))) OR (((peri OR petru) OR peteri) OR petr)) o.s.*".