Perhaps you should try some spelling variations:
petriv » petri (Expand Search), petris (Expand Search), petrov (Expand Search), peteriv (Expand Search), petriiv (Expand Search), petruiv (Expand Search)
petruv » petru (Expand Search), petrov (Expand Search), peteruv (Expand Search), petriuv (Expand Search), petruuv (Expand Search)
petruoi » peteruoi (Expand Search), petriuoi (Expand Search), petruuoi (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search), petrov (Expand Search)
peterov » 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 (((petriv OR petruoi) OR petruv) OR (petr OR ((peterov OR petriov) OR petruv))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriv OR petruoi) OR petruv) OR (petr OR ((peterov OR petriov) OR petruv))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriv OR petruoi) OR petruv) OR (petr OR ((peterov OR petriov) OR petruv))) o.s.*.