Perhaps you should try some spelling variations:
petruv » peteruv (Expand Search), petriuv (Expand Search), petruuv (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petruoiiov » peteruoiiov (Expand Search), petriuoiiov (Expand Search), petruuoiiov (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (Expand Search)
petroui » peteroui (Expand Search), petrioui (Expand Search), petruoui (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 (petriov OR petruoiiov)) OR (((peteri OR petrui) OR petroui) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruv OR (petriov OR petruoiiov)) OR (((peteri OR petrui) OR petroui) OR petr)) o.s.*".