Perhaps you should try some spelling variations:
petruv » petru (Expand Search), petrov (Expand Search), petriuv (Expand Search), petruuv (Expand Search), petrouv (Expand Search)
peteru » petru (Expand Search), peters (Expand Search)
petruuv » petriuuv (Expand Search), petruuuv (Expand Search), petrouuv (Expand Search)
petroooi » petrioooi (Expand Search), petruoooi (Expand Search), petrooooi (Expand Search)
petruio » petriuio (Expand Search), petruuio (Expand Search), petrouio (Expand Search)
petr » petri (Expand Search), petru (Expand Search), petro (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 ((petruv OR petruuv) OR ((((petroooi OR peter) OR peteru) OR petruio) OR (petr OR per))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruv OR petruuv) OR ((((petroooi OR peter) OR peteru) OR petruio) OR (petr OR per))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruv OR petruuv) OR ((((petroooi OR peter) OR peteru) OR petruio) OR (petr OR per))) o.s.*.