Perhaps you should try some spelling variations:
peterov » petrov (Expand Search)
petriov » petrov (Expand Search), peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petroov » petrov (Expand Search), peteroov (Expand Search), petrioov (Expand Search), petruoov (Expand Search)
petruuv » peteruuv (Expand Search), petriuuv (Expand Search), petruuuv (Expand Search)
petruiuuv » peteruiuuv (Expand Search), petriuiuuv (Expand Search), petruuiuuv (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 petriov) OR petroov) OR (petruuv OR petruiuuv)) OR petr) OR peterdi) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((((peterov OR petriov) OR petroov) OR (petruuv OR petruiuuv)) OR petr) OR peterdi) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((((peterov OR petriov) OR petroov) OR (petruuv OR petruiuuv)) OR petr) OR peterdi) o.s.*.