Perhaps you should try some spelling variations:
petriv » petris (Expand Search), petrov (Expand Search), peteriv (Expand Search), petroiv (Expand Search)
petroiv » petrov (Expand Search), peteroiv (Expand Search), petrooiv (Expand Search)
petrois » petris (Expand Search), peterois (Expand Search), petroois (Expand Search)
petru » pentru (Expand Search), peteru (Expand Search), petrou (Expand Search)
peteru » peter (Expand Search), peters (Expand Search)
petr » peter (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: fop ((((petriv OR petroiv) OR petrois) OR petru) OR ((peteru OR petr) OR (petri OR per))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriv OR petroiv) OR petrois) OR petru) OR ((peteru OR petr) OR (petri OR per))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petriv OR petroiv) OR petrois) OR petru) OR ((peteru OR petr) OR (petri OR per))) o.s.*.