Perhaps you should try some spelling variations:
petroiiv » petrov (Expand Search), peteroiiv (Expand Search), petrioiiv (Expand Search), petruoiiv (Expand Search)
petruooiv » peteruooiv (Expand Search), petriuooiv (Expand Search), petruuooiv (Expand Search)
petriiooiv » peteriiooiv (Expand Search), petriiiooiv (Expand Search), petruiiooiv (Expand Search)
petriu » peteriu (Expand Search), petriiu (Expand Search), petruiu (Expand Search)
petruou » peteruou (Expand Search), petriuou (Expand Search), petruuou (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 ((petroiiv OR (petruooiv OR petriiooiv)) OR ((petriu OR petruou) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petroiiv OR (petruooiv OR petriiooiv)) OR ((petriu OR petruou) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petroiiv OR (petruooiv OR petriiooiv)) OR ((petriu OR petruou) OR petr)) o.s.*.