Perhaps you should try some spelling variations:
petriw » petri (Expand Search), petris (Expand Search), petrow (Expand Search), peteriw (Expand Search), petriiw (Expand Search), petruiw (Expand Search)
peterov » petrov (Expand Search)
petruov » petrov (Expand Search), peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petro » petrov (Expand Search), petri (Expand Search), petru (Expand Search), petero (Expand Search), petrio (Expand Search), petruo (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petriv » peteriv (Expand Search), petriiv (Expand Search), petruiv (Expand Search), petri (Expand Search), petris (Expand Search), petrov (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 ((((petriw OR petriw) OR ((peterov OR petruov) OR petro)) o) OR ((petr OR petriv) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriw OR petriw) OR ((peterov OR petruov) OR petro)) o) OR ((petr OR petriv) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petriw OR petriw) OR ((peterov OR petruov) OR petro)) o) OR ((petr OR petriv) _)). s.*.