Perhaps you should try some spelling variations:
petriiov » petrov (Expand Search), peteriiov (Expand Search), petriiiov (Expand Search), petruiiov (Expand Search)
peteriov » petrov (Expand Search)
petruoiov » peteruoiov (Expand Search), petriuoiov (Expand Search), petruuoiov (Expand Search)
petrioi » peterioi (Expand Search), petriioi (Expand Search), petruioi (Expand Search)
petruiioi » peteruiioi (Expand Search), petriuiioi (Expand Search), petruuiioi (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (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 (((petriiov OR peteriov) OR petruoiov) OR (((petrioi OR petruiioi) OR petruov) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriiov OR peteriov) OR petruoiov) OR (((petrioi OR petruiioi) OR petruov) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriiov OR peteriov) OR petruoiov) OR (((petrioi OR petruiioi) OR petruov) OR petr)) o.s.*.