Perhaps you should try some spelling variations:
petrow » petro (Expand Search), petrov (Expand Search), petrowna (Expand Search), petruow (Expand Search), petroow (Expand Search)
petruiuiov » petruuiov (Expand Search), petruuiuiov (Expand Search), petrouiuiov (Expand Search)
petrui » petru (Expand Search), petruui (Expand Search), petroui (Expand Search)
petruuiv » petruuuiv (Expand Search), petrouuiv (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search)
petr » 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 ((petruuiv OR petruiuiov) OR ((petrow OR (petrui OR petri)) OR ((per OR petr) OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruuiv OR petruiuiov) OR ((petrow OR (petrui OR petri)) OR ((per OR petr) OR peter))) o.s.*".