Perhaps you should try some spelling variations:
petriuov » petrov (Expand Search), peteriuov (Expand Search), petriiuov (Expand Search), petruiuov (Expand Search)
petrovov » petrov (Expand Search), petrovvov (Expand Search), petrivov (Expand Search), petruvov (Expand Search), peterovov (Expand Search), petriovov (Expand Search), petruovov (Expand Search)
petruvov » petrov (Expand Search), peteruvov (Expand Search), petriuvov (Expand Search), petruuvov (Expand Search)
petro » petrov (Expand Search), petri (Expand Search), petru (Expand Search), petero (Expand Search), petrio (Expand Search), petruo (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (Expand Search)
petriui » peteriui (Expand Search), petriiui (Expand Search), petruiui (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 ((petriuov OR (petrovov OR petruvov)) OR ((petrui OR petriui) OR (petro OR petr))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriuov OR (petrovov OR petruvov)) OR ((petrui OR petriui) OR (petro OR petr))) o.s.*".