Perhaps you should try some spelling variations:
petriiov » petrov (Expand Search), peteriiov (Expand Search), petriiiov (Expand Search), petroiiov (Expand Search)
petruv » peteruv (Expand Search), petriuv (Expand Search), petrouv (Expand Search)
petruuv » peteruuv (Expand Search), petriuuv (Expand Search), petrouuv (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petrouuo » peterouuo (Expand Search), petriouuo (Expand Search), petroouuo (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 peteruv) OR petriiov) OR petruuv) OR ((petru OR petrouuo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petruv OR peteruv) OR petriiov) OR petruuv) OR ((petru OR petrouuo) OR petr)) o.s.*".