Perhaps you should try some spelling variations:
petruuv » peteruuv (Expand Search), petriuuv (Expand Search), petruuuv (Expand Search)
petriuuv » peteriuuv (Expand Search), petriiuuv (Expand Search), petruiuuv (Expand Search)
petruiuuv » peteruiuuv (Expand Search), petriuiuuv (Expand Search), petruuiuuv (Expand Search)
petruo » peteruo (Expand Search), petriuo (Expand Search), petruuo (Expand Search)
petriuo » peteriuo (Expand Search), petriiuo (Expand Search), petruiuo (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 ((petruuv OR (petriuuv OR petruiuuv)) OR ((petruo OR petriuo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruuv OR (petriuuv OR petruiuuv)) OR ((petruo OR petriuo) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruuv OR (petriuuv OR petruiuuv)) OR ((petruo OR petriuo) OR petr)) o.s.*.