Perhaps you should try some spelling variations:
petr » petri (Expand Search), petro (Expand Search), per (Expand Search)
petroiv » petrioiv (Expand Search), petrooiv (Expand Search), peroiv (Expand Search), petrov (Expand Search)
petriiv » petriiiv (Expand Search), petroiiv (Expand Search), periiv (Expand Search)
petrui » petriui (Expand Search), petroui (Expand Search), perui (Expand Search), petri (Expand Search), pentrui (Expand Search), petrii (Expand Search)
petru » petriu (Expand Search), petrou (Expand Search), peru (Expand Search), pentru (Expand Search), petri (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 ((petr OR (petroiv OR petriiv)) OR (petrui OR (petru OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petr OR (petroiv OR petriiv)) OR (petrui OR (petru OR peter))) o.s.*".