Perhaps you should try some spelling variations:
peterouv » petrov (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petriuiiov » peteriuiiov (Expand Search), petriiuiiov (Expand Search), petruiuiiov (Expand Search)
petruui » peteruui (Expand Search), petriuui (Expand Search), petruuui (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 ((peterouv OR (petriov OR petriuiiov)) OR ((petruui OR petrioui) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peterouv OR (petriov OR petriuiiov)) OR ((petruui OR petrioui) OR petr)) o.s.*".