Perhaps you should try some spelling variations:
petruov » petrov (Expand Search), petriuov (Expand Search), petruuov (Expand Search), petrouov (Expand Search)
petriuo » petriiuo (Expand Search), petruiuo (Expand Search), petroiuo (Expand Search)
petriiuuo » petriiiuuo (Expand Search), petruiiuuo (Expand Search), petroiiuuo (Expand Search)
petriouuuuo » petriiouuuuo (Expand Search), petruiouuuuo (Expand Search), petroiouuuuo (Expand Search)
petroouuuuo » petrioouuuuo (Expand Search), petruoouuuuo (Expand Search), petrooouuuuo (Expand Search)
petr » petri (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 (petruov OR ((petriuo OR (petriiuuo OR (petriouuuuo OR petroouuuuo))) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petruov OR ((petriuo OR (petriiuuo OR (petriouuuuo OR petroouuuuo))) OR (petr OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petruov OR ((petriuo OR (petriiuuo OR (petriouuuuo OR petroouuuuo))) OR (petr OR peter))) o.s.*.