Perhaps you should try some spelling variations:
peterov » petrov (Expand Search)
petriuuv » petriuv (Expand Search), petruuv (Expand Search), petrisuv (Expand Search), peteriuuv (Expand Search), petriiuuv (Expand Search), petruiuuv (Expand Search)
petriu » petri (Expand Search), petru (Expand Search), petris (Expand Search), peteriu (Expand Search), petriiu (Expand Search), petruiu (Expand Search)
peteru » peter (Expand Search), petru (Expand Search), peters (Expand Search)
petroov » petrov (Expand Search), peteroov (Expand Search), petrioov (Expand Search), petruoov (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 (((peterov OR petriuuv) OR (petriu OR (peteru OR petroov))) OR (petr OR per)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((peterov OR petriuuv) OR (petriu OR (peteru OR petroov))) OR (petr OR per)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((peterov OR petriuuv) OR (petriu OR (peteru OR petroov))) OR (petr OR per)) o.s.*.