Perhaps you should try some spelling variations:
"nurses practitioner" » "nurses practitioners"
"purses practitioner" » "purses practitioners", "purse practitioner", "purves practitioner"
"purposes practitioner" » "purposes practitioners", "purpose practitioner", "proposes practitioner"
"curves practitioner" » "curves practitioners", "curvas practitioner"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("nurses practitioner") OR ((((("purses practitioner") OR ("purposes practitioner"))) OR ("curves practitioner"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nurses practitioner\") OR (((((\"purses practitioner\") OR (\"purposes practitioner\"))) OR (\"curves practitioner\"))))*".
• Removing quotes may allow a broader search: (( nurses practitioner ) OR ((((( purses practitioner ) OR ( purposes practitioner ))) OR ( curves practitioner ))))*.