Perhaps you should try some spelling variations:
"fop peterv OR petruv OR peteruv OR petruv OR petro OR petri OR peri OR petr o.s.*" » "fop peterv OR petruv OR peteruv OR petruv OR petrov OR petri OR peri OR petr o.s.*" (Expand Search), "fop peterv OR petruv OR peteruv OR petruv OR petru OR petri OR peri OR petr o.s.*" (Expand Search), "fop peterv OR petruv OR peteruv OR petruv OR petro OR petri OR per OR petr o.s.*" (Expand Search), "fop peterv OR peteruv OR peteruv OR peteruv OR petero OR peteri OR peri OR peter o.s.*" (Expand Search), "fop peterv OR petruuv OR peteruv OR petruuv OR petruo OR petrui OR peri OR petru o.s.*" (Expand Search), "fop peterv OR peruv OR peteruv OR peruv OR pero OR peri OR peri OR per o.s.*" (Expand Search)

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

• Removing quotes may allow a broader search: fop ((peterv OR (petruv OR peteruv)) OR (petruv OR ((petro OR (petri OR peri)) OR petr))) o.s.*.