Perhaps you should try some spelling variations:
petroov » petrov (Expand Search), petruoov (Expand Search), petrooov (Expand Search), peroov (Expand Search)
petero » peters (Expand Search), petro (Expand Search)
petruuuiv » petruuuuiv (Expand Search), petrouuuiv (Expand Search), peruuuiv (Expand Search)
petruiuuiv » petruuiuuiv (Expand Search), petrouiuuiv (Expand Search), peruiuuiv (Expand Search)
petr » petru (Expand Search), petro (Expand Search), per (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search), peri (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 ((petruuuiv OR petruiuuiv) OR ((petroov OR petero) OR ((petr OR petri) OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruuuiv OR petruiuuiv) OR ((petroov OR petero) OR ((petr OR petri) OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruuuiv OR petruiuuiv) OR ((petroov OR petero) OR ((petr OR petri) OR peter))) o.s.*.