Perhaps you should try some spelling variations:
petrov » petro (Expand Search), petruov (Expand Search), petroov (Expand Search), perov (Expand Search)
petriov » petruiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petruiov » petruuiov (Expand Search), petrouiov (Expand Search), peruiov (Expand Search)
petroiuiov » petruoiuiov (Expand Search), petrooiuiov (Expand Search), peroiuiov (Expand Search)
petr » petru (Expand Search), petro (Expand Search), per (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search), peri (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 ((((petriov OR petruiov) OR petrov) OR petroiuiov) OR ((petr OR peter) OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriov OR petruiov) OR petrov) OR petroiuiov) OR ((petr OR peter) OR petri)) o.s.*".