Perhaps you should try some spelling variations:
petruw » peteruw (Expand Search), petruuw (Expand Search), peruw (Expand Search)
petr » peter (Expand Search), petru (Expand Search), per (Expand Search)
petro » petero (Expand Search), petruo (Expand Search), pero (Expand Search), petrov (Expand Search), petru (Expand Search)
petruov » peteruov (Expand Search), petruuov (Expand Search), peruov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), peri (Expand Search)
petrui » peterui (Expand Search), petruui (Expand Search), perui (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 (((petruw OR (petruw OR petr)) o) OR (((petro OR petruov) OR (petri OR petrui)) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruw OR (petruw OR petr)) o) OR (((petro OR petruov) OR (petri OR petrui)) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petruw OR (petruw OR petr)) o) OR (((petro OR petruov) OR (petri OR petrui)) _)). s.*.