Perhaps you should try some spelling variations:
petruv » petru (Expand Search), petrov (Expand Search), peteruv (Expand Search), petruuv (Expand Search), petrouv (Expand Search)
petruuv » peteruuv (Expand Search), petruuuv (Expand Search), petrouuv (Expand Search)
petruuuv » peteruuuv (Expand Search), petruuuuv (Expand Search), petrouuuv (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petruov » peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search), petrov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 (((petruv OR (petruuv OR (petruuuv OR peteruuuv))) OR petr) OR (petruov OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruv OR (petruuv OR (petruuuv OR peteruuuv))) OR petr) OR (petruov OR petri)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petruv OR (petruuv OR (petruuuv OR peteruuuv))) OR petr) OR (petruov OR petri)) o.s.*.