Perhaps you should try some spelling variations:
peteroiv » petrov (Expand Search), peterdi (Expand Search)
petruuuiv » peteruuuiv (Expand Search), petruuuuiv (Expand Search), petrouuuiv (Expand Search)
petruuuuuiv » peteruuuuuiv (Expand Search), petruuuuuuiv (Expand Search), petrouuuuuiv (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruui » peteruui (Expand Search), petruuui (Expand Search), petrouui (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: fop ((peteroiv OR (peteruuiv OR (petruuuiv OR petruuuuuiv))) OR ((petri OR petruui) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peteroiv OR (peteruuiv OR (petruuuiv OR petruuuuuiv))) OR ((petri OR petruui) OR petr)) o.s.*".