Perhaps you should try some spelling variations:
petriiov » petrov (Expand Search), peteriiov (Expand Search), petriiiov (Expand Search), petruiiov (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petruiiiov » peteruiiiov (Expand Search), petriuiiiov (Expand Search), petruuiiiov (Expand Search)
petriiuiov » peteriiuiov (Expand Search), petriiiuiov (Expand Search), petruiiuiov (Expand Search)
petriiiuiov » peteriiiuiov (Expand Search), petriiiiuiov (Expand Search), petruiiiuiov (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 (petriiov OR petruiiiov)) OR (petriiuiov OR petriiiuiov)) OR petr) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriov OR (petriiov OR petruiiiov)) OR (petriiuiov OR petriiiuiov)) OR petr) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriov OR (petriiov OR petruiiiov)) OR (petriiuiov OR petriiiuiov)) OR petr) o.s.*.