Perhaps you should try some spelling variations:
petruov » petrov (Expand Search), peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petruv » petru (Expand Search), petrov (Expand Search), peteruv (Expand Search), petriuv (Expand Search), petruuv (Expand Search)
peterov » petrov (Expand Search)
peteru » peter (Expand Search), petru (Expand Search), peters (Expand Search)
petriuv » peteriuv (Expand Search), petriiuv (Expand Search), petruiuv (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 (((petruov OR (petruv OR petriuv)) OR (peterov OR peteru)) OR (petr OR per)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruov OR (petruv OR petriuv)) OR (peterov OR peteru)) OR (petr OR per)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petruov OR (petruv OR petriuv)) OR (peterov OR peteru)) OR (petr OR per)) o.s.*.