Perhaps you should try some spelling variations:
petroov » petrov (Expand Search), peteroov (Expand Search), petrooov (Expand Search)
peterov » petrov (Expand Search)
petr » peter (Expand Search), petro (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), pentru (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search)
petruui » peteruui (Expand Search), petrouui (Expand Search), pentruui (Expand Search)
peteri » peterdi (Expand Search), 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 peterov) OR (((petr OR petru) OR ((petri OR peteri) OR petruui)) OR per)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petroov OR peterov) OR (((petr OR petru) OR ((petri OR peteri) OR petruui)) OR per)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petroov OR peterov) OR (((petr OR petru) OR ((petri OR peteri) OR petruui)) OR per)) o.s.*.