Perhaps you should try some spelling variations:
peteriov » petrov (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petriuuv » peteriuuv (Expand Search), petriiuuv (Expand Search), petruiuuv (Expand Search)
petriiiuv » peteriiiuv (Expand Search), petriiiiuv (Expand Search), petruiiiuv (Expand Search)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 (((((petruov OR petruov) OR peteriov) OR (petriuuv OR petriiiuv)) OR petriiv) OR petr) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((((petruov OR petruov) OR peteriov) OR (petriuuv OR petriiiuv)) OR petriiv) OR petr) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((((petruov OR petruov) OR peteriov) OR (petriuuv OR petriiiuv)) OR petriiv) OR petr) o.s.*.