Perhaps you should try some spelling variations:
peri » per (Expand Search)
petruiv » peteruiv (Expand Search), petrouiv (Expand Search), peruiv (Expand Search)
petruv » peteruv (Expand Search), petrouv (Expand Search), peruv (Expand Search)
petriiuv » peteriiuv (Expand Search), petroiiuv (Expand Search), periiuv (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (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 (((peterov OR petruiv) OR (petruv OR petriiuv)) OR (((petru OR petri) OR peri) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((peterov OR petruiv) OR (petruv OR petriiuv)) OR (((petru OR petri) OR peri) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((peterov OR petruiv) OR (petruv OR petriiuv)) OR (((petru OR petri) OR peri) OR petr)) o.s.*.