Perhaps you should try some spelling variations:
petruov » petrov (Expand Search), petruuov (Expand Search), petrouov (Expand Search), peruov (Expand Search)
petruiio » petruuiio (Expand Search), petrouiio (Expand Search), peruiio (Expand Search)
petruuuio » petruuuuio (Expand Search), petrouuuio (Expand Search), peruuuio (Expand Search)
petriiuio » petruiiuio (Expand Search), petroiiuio (Expand Search), periiuio (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 (petruov OR ((petruiio OR (petruuuio OR petriiuio)) OR ((petr OR petri) OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petruov OR ((petruiio OR (petruuuio OR petriiuio)) OR ((petr OR petri) OR peter))) o.s.*".