Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petriv (Expand Search), petrisv (Expand Search), peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petrio » petri (Expand Search), petris (Expand Search), petro (Expand Search), peterio (Expand Search), petriio (Expand Search), petruio (Expand Search)
petruuo » peteruuo (Expand Search), petriuuo (Expand Search), petruuuo (Expand Search)
petruoio » peteruoio (Expand Search), petriuoio (Expand Search), petruuoio (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 (petriov OR (((petruuo OR petruuo) OR (petrio OR petruoio)) OR (petr OR peterdi))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriov OR (((petruuo OR petruuo) OR (petrio OR petruoio)) OR (petr OR peterdi))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petriov OR (((petruuo OR petruuo) OR (petrio OR petruoio)) OR (petr OR peterdi))) o.s.*.