Perhaps you should try some spelling variations:
petrouuv » petrov (Expand Search), peterouuv (Expand Search), petruouuv (Expand Search), petroouuv (Expand Search)
petruv » peteruv (Expand Search), petruuv (Expand Search), petrouv (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruui » peteruui (Expand Search), petruuui (Expand Search), petrouui (Expand Search)
petrouo » peterouo (Expand Search), petruouo (Expand Search), petroouo (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 ((peterouiv OR (petruv OR petrouuv)) OR (((petri OR petruui) OR petrouo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peterouiv OR (petruv OR petrouuv)) OR (((petri OR petruui) OR petrouo) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peterouiv OR (petruv OR petrouuv)) OR (((petri OR petruui) OR petrouo) OR petr)) o.s.*.