Perhaps you should try some spelling variations:
petruoov » petrov (Expand Search), peteruoov (Expand Search), petruuoov (Expand Search), petrouoov (Expand Search)
petruuov » petrov (Expand Search), peteruuov (Expand Search), petruuuov (Expand Search), petrouuov (Expand Search)
peterui » peterdi (Expand Search)
petruiv » peteruiv (Expand Search), petruuiv (Expand Search), petrouiv (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 ((((petruoov OR petruuov) OR peterov) OR petruiv) OR ((petri OR peterui) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petruoov OR petruuov) OR peterov) OR petruiv) OR ((petri OR peterui) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petruoov OR petruuov) OR peterov) OR petruiv) OR ((petri OR peterui) OR petr)) o.s.*.