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)
petroi » peteroi (Expand Search), petrioi (Expand Search), petrooi (Expand Search), petri (Expand Search), petro (Expand Search), petrov (Expand Search)
petriioi » peteriioi (Expand Search), petriiioi (Expand Search), petroiioi (Expand Search)
petriuui » peteriuui (Expand Search), petriiuui (Expand Search), petroiuui (Expand Search)
petrooi » peterooi (Expand Search), petriooi (Expand Search), petroooi (Expand Search)
peters » peter (Expand Search), petersen (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 (peters OR petru)) OR (((petroi OR petriioi) OR petriuui) OR petrooi)) _. s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petr OR (peters OR petru)) OR (((petroi OR petriioi) OR petriuui) OR petrooi)) _. s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petr OR (peters OR petru)) OR (((petroi OR petriioi) OR petriuui) OR petrooi)) _. s.*.