Perhaps you should try some spelling variations:
perse » perseo, pese, verse
persello » perseollo, pesello, versello, perello
persao » persano, versao, persa
peso » pero, paso, eso
persas » personas
vera » era, ver, sera
curse » course, cure
cursa » cursan, cura, curia

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((nurses OR ((perse OR (((persao OR peso) OR (persas OR (vera OR vega))) OR persello)) OR ((curse OR curso) OR cursa))) OR nurkse) practitioners~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((nurses OR ((perse OR (((persao OR peso) OR (persas OR (vera OR vega))) OR persello)) OR ((curse OR curso) OR cursa))) OR nurkse) practitioners".
• Adding a wildcard symbol may retrieve word variants: ((nurses OR ((perse OR (((persao OR peso) OR (persas OR (vera OR vega))) OR persello)) OR ((curse OR curso) OR cursa))) OR nurkse) practitioners*.