Perhaps you should try some spelling variations:
petruiov » petrov (Expand Search), peteruiov (Expand Search), petruuiov (Expand Search), petrouiov (Expand Search)
petrouov » petrov (Expand Search), peterouov (Expand Search), petruouov (Expand Search), petroouov (Expand Search)
petriiv » peteriiv (Expand Search), petruiiv (Expand Search), petroiiv (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petrio » peterio (Expand Search), petruio (Expand Search), petroio (Expand Search)
petriiio » peteriiio (Expand Search), petruiiio (Expand Search), petroiiio (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: fop (((petriiv OR petruiov) OR petrouov) OR ((petri OR (petrio OR petriiio)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriiv OR petruiov) OR petrouov) OR ((petri OR (petrio OR petriiio)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriiv OR petruiov) OR petrouov) OR ((petri OR (petrio OR petriiio)) OR petr)) o.s.*.