Perhaps you should try some spelling variations:
"public private partnership" » "public private partnerships", "public private partieship", "public private learnership", "public private prayership"
"public private partners" » "public private parties", "public private learners", "public private prayers"
"public private papers" » "public private prayer", "public private property", "public private learners"

Try widening your search to All Fields.

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("public private partners") OR ("public private papers"))) OR ("public private partnership")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public private partners\") OR (\"public private papers\"))) or (\"public private partnership\"))".
• Removing quotes may allow a broader search: (((( public private partners ) OR ( public private papers ))) or ( public private partnership )).
• Adding a wildcard symbol may retrieve word variants: (((("public private partners") OR ("public private papers"))) or ("public private partnership"))*.