Perhaps you should try some spelling variations:
petruuov » petrov (Expand Search), peteruuov (Expand Search), petriuuov (Expand Search), petruuuov (Expand Search)
petruuuv » peteruuuv (Expand Search), petriuuuv (Expand Search), petruuuuv (Expand Search)
petruuo » peteruuo (Expand Search), petriuuo (Expand Search), petruuuo (Expand Search)
petrio » peterio (Expand Search), petriio (Expand Search), petruio (Expand Search)
petruuio » peteruuio (Expand Search), petriuuio (Expand Search), petruuuio (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 ((petruuuv OR petruuov) OR (((petero OR petruuo) OR (petrio OR petruuio)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruuuv OR petruuov) OR (((petero OR petruuo) OR (petrio OR petruuio)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruuuv OR petruuov) OR (((petero OR petruuo) OR (petrio OR petruuio)) OR petr)) o.s.*.