Perhaps you should try some spelling variations:
petroov » petrov (Expand Search), peteroov (Expand Search), petruoov (Expand Search), petrooov (Expand Search)
petroioov » peteroioov (Expand Search), petruoioov (Expand Search), petrooioov (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petruu » peteruu (Expand Search), petruuu (Expand Search), petrouu (Expand Search), petru (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
peterov » petrov (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 petroioov) OR (petroioov OR (petr OR peterov))) OR (petruu OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petroov OR petroioov) OR (petroioov OR (petr OR peterov))) OR (petruu OR petri)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petroov OR petroioov) OR (petroioov OR (petr OR peterov))) OR (petruu OR petri)) o.s.*.