Perhaps you should try some spelling variations:
petrouiv » petrov (Expand Search), peterouiv (Expand Search), petruouiv (Expand Search), petroouiv (Expand Search)
petruov » peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search)
petroov » peteroov (Expand Search), petruoov (Expand Search), petrooov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petrui » peterui (Expand Search), petruui (Expand Search), petroui (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 (((petrouiv OR periv) OR petruov) OR (((pero OR petroov) OR (petri OR petrui)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petrouiv OR periv) OR petruov) OR (((pero OR petroov) OR (petri OR petrui)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petrouiv OR periv) OR petruov) OR (((pero OR petroov) OR (petri OR petrui)) OR petr)) o.s.*.