Perhaps you should try some spelling variations:
peterov » petrov (Expand Search)
petriov » petrov (Expand Search), peteriov (Expand Search), petriiov (Expand Search), petroiov (Expand Search)
pero » petro (Expand Search), per (Expand Search), pro (Expand Search)
petroi » petri (Expand Search), petro (Expand Search), petrov (Expand Search), peteroi (Expand Search), petrioi (Expand Search), petrooi (Expand Search)
petrui » petri (Expand Search), peterui (Expand Search), petriui (Expand Search), petroui (Expand Search), petrii (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petro (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search), petri (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 petriov) OR ((pero OR (petroi OR petrui)) OR (petr OR (petru OR pentru)))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peterov OR petriov) OR ((pero OR (petroi OR petrui)) OR (petr OR (petru OR pentru)))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peterov OR petriov) OR ((pero OR (petroi OR petrui)) OR (petr OR (petru OR pentru)))) o.s.*.