Perhaps you should try some spelling variations:
petruoov » petrov (Expand Search), peteruoov (Expand Search), petriuoov (Expand Search), petruuoov (Expand Search)
peteruui » peterdi (Expand Search)
petriuoov » peteriuoov (Expand Search), petriiuoov (Expand Search), petruiuoov (Expand Search)
petriui » peteriui (Expand Search), petriiui (Expand Search), petruiui (Expand Search)
petruio » peteruio (Expand Search), petriuio (Expand Search), petruuio (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 ((petruoov OR petriuoov) OR (((peteri OR (petriui OR peteruui)) OR petruio) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruoov OR petriuoov) OR (((peteri OR (petriui OR peteruui)) OR petruio) OR petr)) o.s.*".