Perhaps you should try some spelling variations:
petriuv » peteriuv (Expand Search), petruiuv (Expand Search), petroiuv (Expand Search)
petruuuv » peteruuuv (Expand Search), petruuuuv (Expand Search), petrouuuv (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petriiuo » peteriiuo (Expand Search), petruiiuo (Expand Search), petroiiuo (Expand Search)
petruuo » peteruuo (Expand Search), petruuuo (Expand Search), petrouuo (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 (((petriuv OR petruuuv) OR petruuuv) OR ((petri OR (petriiuo OR petruuo)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriuv OR petruuuv) OR petruuuv) OR ((petri OR (petriiuo OR petruuo)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriuv OR petruuuv) OR petruuuv) OR ((petri OR (petriiuo OR petruuo)) OR petr)) o.s.*.