Perhaps you should try some spelling variations:
petriivw » peteriivw (Expand Search), petruiivw (Expand Search), petroiivw (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petruov » peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search)
petrov » peterov (Expand Search), petruov (Expand Search), petroov (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petrow » peterow (Expand Search), petruow (Expand Search), petroow (Expand Search), petro (Expand Search), petrowna (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: fop (((petriivw OR peterivw) o) OR (((petr OR (petruov OR petrov)) OR (petri OR petrow)) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriivw OR peterivw) o) OR (((petr OR (petruov OR petrov)) OR (petri OR petrow)) _)). s.*".