Perhaps you should try some spelling variations:
peteriov » petrov (Expand Search)
petruv » peteruv (Expand Search), petriuv (Expand Search), petruuv (Expand Search)
petruiiiov » peteruiiiov (Expand Search), petriuiiiov (Expand Search), petruuiiiov (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (Expand Search)
petrioui » peterioui (Expand Search), petriioui (Expand Search), petruioui (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 ((petruv OR (peteriov OR petruiiiov)) OR ((petrui OR petrioui) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruv OR (peteriov OR petruiiiov)) OR ((petrui OR petrioui) OR petr)) o.s.*".