Perhaps you should try some spelling variations:
petriuv » petriiuv (Expand Search), petruiuv (Expand Search), petroiuv (Expand Search)
petriiuv » petriiiuv (Expand Search), petruiiuv (Expand Search), petroiiuv (Expand Search)
petruuv » petriuuv (Expand Search), petruuuv (Expand Search), petrouuv (Expand Search)
petr » petri (Expand Search), petru (Expand Search), petro (Expand Search)
petriov » petriiov (Expand Search), petruiov (Expand Search), petroiov (Expand Search), petrov (Expand Search)
petriuuiv » petriiuuiv (Expand Search), petruiuuiv (Expand Search), petroiuuiv (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 (((petriuv OR petriiuv) OR petruuv) OR ((petr OR (petriov OR petriuuiv)) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriuv OR petriiuv) OR petruuv) OR ((petr OR (petriov OR petriuuiv)) OR peter)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriuv OR petriiuv) OR petruuv) OR ((petr OR (petriov OR petriuuiv)) OR peter)) o.s.*.