Perhaps you should try some spelling variations:
petroov » petrov (Expand Search), peteroov (Expand Search), petruoov (Expand Search), petrooov (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petroi » peteroi (Expand Search), petruoi (Expand Search), petrooi (Expand Search), petro (Expand Search), petrov (Expand Search), petrow (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
peteru » peter (Expand Search), petru (Expand Search), peters (Expand Search)
peterv » peter (Expand Search), peters (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 (petr OR peteru)) OR peterv) OR (petroi OR (petri OR peterdi))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petroov OR (petr OR peteru)) OR peterv) OR (petroi OR (petri OR peterdi))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petroov OR (petr OR peteru)) OR peterv) OR (petroi OR (petri OR peterdi))) o.s.*.