Perhaps you should try some spelling variations:
petroov » petrov (Expand Search), peteroov (Expand Search), petrooov (Expand Search), peroov (Expand Search)
petruov » petrov (Expand Search), peteruov (Expand Search), petrouov (Expand Search), peruov (Expand Search), pentruov (Expand Search)
peterow » petrow (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (Expand Search), pentru (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (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 (((petroov OR petruov) OR perou) OR (peterow OR (petr OR (petru OR petri)))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petroov OR petruov) OR perou) OR (peterow OR (petr OR (petru OR petri)))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petroov OR petruov) OR perou) OR (peterow OR (petr OR (petru OR petri)))) o.s.*.