Perhaps you should try some spelling variations:
petrov » petro (Expand Search), peterov (Expand Search), petruov (Expand Search), petroov (Expand Search)
petero » peter (Expand Search), peters (Expand Search), petro (Expand Search)
petruiiv » peteruiiv (Expand Search), petruuiiv (Expand Search), petrouiiv (Expand Search)
petruiio » peteruiio (Expand Search), petruuiio (Expand Search), petrouiio (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 ((petruiiv OR peteriiuv) OR (((petrov OR petruiio) OR petero) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruiiv OR peteriiuv) OR (((petrov OR petruiio) OR petero) OR (petr OR petri))) o.s.*".