Perhaps you should try some spelling variations:
peteri » peterdi (Expand Search), petri (Expand Search), peters (Expand Search)
petriov » petrov (Expand Search), petriiov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petrv » petrov (Expand Search), petri (Expand Search), petru (Expand Search), petriv (Expand Search), petruv (Expand Search)
petruui » petriuui (Expand Search), petruuui (Expand Search), petrouui (Expand Search)
petruuv » petriuuv (Expand Search), petruuuv (Expand Search), petrouuv (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 ((((petruui OR peteri) OR peteri) OR petriov) OR ((petrv OR petruuv) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petruui OR peteri) OR peteri) OR petriov) OR ((petrv OR petruuv) OR (petr OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petruui OR peteri) OR peteri) OR petriov) OR ((petrv OR petruuv) OR (petr OR peter))) o.s.*.