Perhaps you should try some spelling variations:
petruouv » petrov (Expand Search), peteruouv (Expand Search), petriuouv (Expand Search), petruuouv (Expand Search)
petroouv » petrov (Expand Search), peteroouv (Expand Search), petrioouv (Expand Search), petruoouv (Expand Search)
petruoi » peteruoi (Expand Search), petriuoi (Expand Search), petruuoi (Expand Search)
petruo » peteruo (Expand Search), petriuo (Expand Search), petruuo (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (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 ((petruouv OR petroouv) OR ((((peteri OR petruoi) OR petruo) OR petriov) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruouv OR petroouv) OR ((((peteri OR petruoi) OR petruo) OR petriov) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruouv OR petroouv) OR ((((peteri OR petruoi) OR petruo) OR petriov) OR petr)) o.s.*.