Perhaps you should try some spelling variations:
perov » petrov (Expand Search)
petriiov » petrov (Expand Search), peteriiov (Expand Search), petriiiov (Expand Search), petruiiov (Expand Search)
petro » petrov (Expand Search), petri (Expand Search), petru (Expand Search), petero (Expand Search), petrio (Expand Search), petruo (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petruiu » peteruiu (Expand Search), petriuiu (Expand Search), petruuiu (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 perov) OR petriiov) OR peteruv) OR ((petro OR petruiu) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriov OR perov) OR petriiov) OR peteruv) OR ((petro OR petruiu) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petriov OR perov) OR petriiov) OR peteruv) OR ((petro OR petruiu) OR petr)) o.s.*.