Perhaps you should try some spelling variations:
peterov » petrov (Expand Search), peterv (Expand Search), petersv (Expand Search)
petruv » petru (Expand Search), petrov (Expand Search), peteruv (Expand Search), petruuv (Expand Search), petrouv (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petruio » peteruio (Expand Search), petruuio (Expand Search), petrouio (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petero » peter (Expand Search), peters (Expand Search), petro (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 petruv) OR petr) OR peterov) OR ((petero OR petruio) OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((peterov OR petruv) OR petr) OR peterov) OR ((petero OR petruio) OR petri)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((peterov OR petruv) OR petr) OR peterov) OR ((petero OR petruio) OR petri)) o.s.*.