Perhaps you should try some spelling variations:
petruuov » petrov (Expand Search), peteruuov (Expand Search), petrouuov (Expand Search), peruuov (Expand Search)
petruv » peteruv (Expand Search), petrouv (Expand Search), peruv (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (Expand Search)
petruui » peteruui (Expand Search), petrouui (Expand Search), peruui (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (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 ((peteruiov OR petruv) OR (((petru OR (petri OR petruui)) OR petruuov) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peteruiov OR petruv) OR (((petru OR (petri OR petruui)) OR petruuov) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peteruiov OR petruv) OR (((petru OR (petri OR petruui)) OR petruuov) OR petr)) o.s.*.