Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petriuuov » peteriuuov (Expand Search), petriiuuov (Expand Search), petruiuuov (Expand Search)
petruv » peteruv (Expand Search), petriuv (Expand Search), petruuv (Expand Search)
petriuv » peteriuv (Expand Search), petriiuv (Expand Search), petruiuv (Expand Search)
petruiiuv » peteruiiuv (Expand Search), petriuiiuv (Expand Search), petruuiiuv (Expand Search)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (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 petriuuov) OR (petruv OR (petriuv OR petruiiuv))) OR petriiv) OR petr) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriov OR petriuuov) OR (petruv OR (petriuv OR petruiiuv))) OR petriiv) OR petr) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petriov OR petriuuov) OR (petruv OR (petriuv OR petruiiuv))) OR petriiv) OR petr) o.s.*.