Perhaps you should try some spelling variations:
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petruv » peteruv (Expand Search), petruuv (Expand Search), petrouv (Expand Search), petru (Expand Search), petrov (Expand Search)
petriv » peteriv (Expand Search), petruiv (Expand Search), petroiv (Expand Search), petris (Expand Search), petrov (Expand Search)
petriio » peteriio (Expand Search), petruiio (Expand Search), petroiio (Expand Search)
petriu » peteriu (Expand Search), petruiu (Expand Search), petroiu (Expand Search), petru (Expand Search), petris (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 (((petr OR petruv) OR petriv) OR (((petriio OR petriu) OR perio) OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petr OR petruv) OR petriv) OR (((petriio OR petriu) OR perio) OR petri)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petr OR petruv) OR petriv) OR (((petriio OR petriu) OR perio) OR petri)) o.s.*.