Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petriiov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petruio » petrio (Expand Search), petruo (Expand Search), petriuio (Expand Search), petruuio (Expand Search), petrouio (Expand Search)
petrui » petri (Expand Search), petru (Expand Search), petriui (Expand Search), petruui (Expand Search), petroui (Expand Search)
petruoi » petriuoi (Expand Search), petruuoi (Expand Search), petrouoi (Expand Search)
petruoiuo » petriuoiuo (Expand Search), petruuoiuo (Expand Search), petrouoiuo (Expand Search)
petr » petri (Expand Search), petru (Expand Search), petro (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 (((petruio OR (petruoi OR petrui)) OR petruoiuo) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriov OR (((petruio OR (petruoi OR petrui)) OR petruoiuo) OR (petr OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petriov OR (((petruio OR (petruoi OR petrui)) OR petruoiuo) OR (petr OR peter))) o.s.*.