Perhaps you should try some spelling variations:
petruv » peteruv (Expand Search), petriuv (Expand Search), petrouv (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petrio » peterio (Expand Search), petriio (Expand Search), petroio (Expand Search)
petrov » peterov (Expand Search), petriov (Expand Search), petroov (Expand Search)
petriui » peteriui (Expand Search), petriiui (Expand Search), petroiui (Expand Search)
petr » peter (Expand Search), petri (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 ((petruv OR (peruuv OR peruuuv)) OR ((((petru OR petrio) OR petrov) OR petriui) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruv OR (peruuv OR peruuuv)) OR ((((petru OR petrio) OR petrov) OR petriui) OR petr)) o.s.*".