Perhaps you should try some spelling variations:
peteruov » petrov (Expand Search)
petruiov » petrov (Expand Search), peteruiov (Expand Search), petriuiov (Expand Search), petruuiov (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petruuiv » peteruuiv (Expand Search), petriuuiv (Expand Search), petruuuiv (Expand Search)
petruui » peteruui (Expand Search), petriuui (Expand Search), petruuui (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 peteruov) OR (petriov OR petruiov)) OR petruuiv) OR (petruui OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((peterov OR peteruov) OR (petriov OR petruiov)) OR petruuiv) OR (petruui OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((peterov OR peteruov) OR (petriov OR petruiov)) OR petruuiv) OR (petruui OR petr)) o.s.*.