Perhaps you should try some spelling variations:
peteruov » petrov (Expand Search)
petriuov » petrov (Expand Search), peteriuov (Expand Search), petriiuov (Expand Search), petruiuov (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petruiuo » peteruiuo (Expand Search), petriuiuo (Expand Search), petruuiuo (Expand Search)
petriui » peteriui (Expand Search), petriiui (Expand Search), petruiui (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 peteruov) OR petriuov) OR (((petruiuo OR petruiuo) OR petriui) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruov OR peteruov) OR petriuov) OR (((petruiuo OR petruiuo) OR petriui) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petruov OR peteruov) OR petriuov) OR (((petruiuo OR petruiuo) OR petriui) OR petr)) o.s.*.