Perhaps you should try some spelling variations:
petruov » petrov (Expand Search), petriuov (Expand Search), petruuov (Expand Search), petrouov (Expand Search)
petrv » petrov (Expand Search), petri (Expand Search), petru (Expand Search), petriv (Expand Search), petruv (Expand Search)
petr » petri (Expand Search), petru (Expand Search), petro (Expand Search)
petruv » petriuv (Expand Search), petruuv (Expand Search), petrouv (Expand Search), petru (Expand Search), petrov (Expand Search)
petruiuv » petriuiuv (Expand Search), petruuiuv (Expand Search), petrouiuv (Expand Search)
peterv » peters (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 ((((petrv OR petr) OR peterv) OR (petruv OR petruiuv)) OR peteriv)) OR peter) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruov OR ((((petrv OR petr) OR peterv) OR (petruv OR petruiuv)) OR peteriv)) OR peter) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruov OR ((((petrv OR petr) OR peterv) OR (petruv OR petruiuv)) OR peteriv)) OR peter) o.s.*.