Perhaps you should try some spelling variations:
petruoiv » petrov (Expand Search), peteruoiv (Expand Search), petruuoiv (Expand Search), petrouoiv (Expand Search)
petriv » peteriv (Expand Search), petruiv (Expand Search), petroiv (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petriui » peteriui (Expand Search), petruiui (Expand Search), petroiui (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 ((petriv OR petruoiv) OR (((petri OR (petriui OR petruui)) OR peteri) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriv OR petruoiv) OR (((petri OR (petriui OR petruui)) OR peteri) OR petr)) o.s.*".