Perhaps you should try some spelling variations:
petriiv » peteriiv (Expand Search), petruiiv (Expand Search), petroiiv (Expand Search)
petriov » peteriov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petruiiov » peteruiiov (Expand Search), petruuiiov (Expand Search), petrouiiov (Expand Search)
petriuiiov » peteriuiiov (Expand Search), petruiuiiov (Expand Search), petroiuiiov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (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 ((petriiv OR (petriov OR (petruiiov OR petriuiiov))) OR ((petri OR petriov) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriiv OR (petriov OR (petruiiov OR petriuiiov))) OR ((petri OR petriov) OR petr)) o.s.*".