Perhaps you should try some spelling variations:
petrovw » petrov (Expand Search), petrow (Expand Search), peterovw (Expand Search), petriovw (Expand Search), petruovw (Expand Search)
peterov » petrov (Expand Search)
petrivw » peterivw (Expand Search), petriivw (Expand Search), petruivw (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petriui » peteriui (Expand Search), petriiui (Expand Search), petruiui (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (Expand Search), petri (Expand Search), petro (Expand Search), petrov (Expand Search)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (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 (((petrovw OR petrivw) o) OR ((peterov OR ((petr OR (petriui OR petroi)) OR petriiv)) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petrovw OR petrivw) o) OR ((peterov OR ((petr OR (petriui OR petroi)) OR petriiv)) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petrovw OR petrivw) o) OR ((peterov OR ((petr OR (petriui OR petroi)) OR petriiv)) _)). s.*.