Perhaps you should try some spelling variations:
petr » peter (Expand Search), petri (Expand Search), petro (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search), pentru (Expand Search), petri (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petroiov (Expand Search), petrov (Expand Search)
petrooi » peterooi (Expand Search), petriooi (Expand Search), petroooi (Expand Search)
petroooi » peteroooi (Expand Search), petrioooi (Expand Search), petrooooi (Expand Search)
peterov » petrov (Expand Search)
peteri » peterdi (Expand Search), peter (Expand Search), petri (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 ((petr OR (petru OR (petriov OR peterov))) OR (peteri OR (petrooi OR petroooi))) _. s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petr OR (petru OR (petriov OR peterov))) OR (peteri OR (petrooi OR petroooi))) _. s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petr OR (petru OR (petriov OR peterov))) OR (peteri OR (petrooi OR petroooi))) _. s.*.