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)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petriuuov » peteriuuov (Expand Search), petriiuuov (Expand Search), petruiuuov (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 ((((petriov OR petruov) OR (petriuuov OR peteruov)) OR (petruiov OR petruiov)) OR petr) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriov OR petruov) OR (petriuuov OR peteruov)) OR (petruiov OR petruiov)) OR petr) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petriov OR petruov) OR (petriuuov OR peteruov)) OR (petruiov OR petruiov)) OR petr) o.s.*.