Perhaps you should try some spelling variations:
petruuov » petrov (Expand Search), peteruuov (Expand Search), petruuuov (Expand Search), petrouuov (Expand Search)
peru » petru (Expand Search), per (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruoi » peteruoi (Expand Search), petruuoi (Expand Search), petrouoi (Expand Search)
petriu » peteriu (Expand Search), petruiu (Expand Search), petroiu (Expand Search)
petroiu » peteroiu (Expand Search), petruoiu (Expand Search), petrooiu (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 ((peterov OR petruuov) OR ((((petri OR petruoi) OR peru) OR (petriu OR petroiu)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peterov OR petruuov) OR ((((petri OR petruoi) OR peru) OR (petriu OR petroiu)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peterov OR petruuov) OR ((((petri OR petruoi) OR peru) OR (petriu OR petroiu)) OR petr)) o.s.*.