Perhaps you should try some spelling variations:
peterov » petrov (Expand Search)
petroa » petro (Expand Search), petrov (Expand Search), petra (Expand Search), peteroa (Expand Search), petruoa (Expand Search), petrooa (Expand Search)
petera » peter (Expand Search), peters (Expand Search), petra (Expand Search)
petrua » petru (Expand Search), petra (Expand Search), peterua (Expand Search), petruua (Expand Search), petroua (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 (((petroa OR petera) OR (petrua OR petera)) OR petr)) OR petri) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peterov OR (((petroa OR petera) OR (petrua OR petera)) OR petr)) OR petri) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peterov OR (((petroa OR petera) OR (petrua OR petera)) OR petr)) OR petri) o.s.*.