Perhaps you should try some spelling variations:
petriuov » petrov (Expand Search), peteriuov (Expand Search), petruiuov (Expand Search), petroiuov (Expand Search)
peteriov » petrov (Expand Search)
petruiv » peteruiv (Expand Search), petruuiv (Expand Search), petrouiv (Expand Search)
petruuv » peteruuv (Expand Search), petruuuv (Expand Search), petrouuv (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petriuo » peteriuo (Expand Search), petruiuo (Expand Search), petroiuo (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (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 ((((petriuov OR petruiv) OR peteriov) OR petruuv) OR ((petri OR petriuo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriuov OR petruiv) OR peteriov) OR petruuv) OR ((petri OR petriuo) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petriuov OR petruiv) OR peteriov) OR petruuv) OR ((petri OR petriuo) OR petr)) o.s.*.