Perhaps you should try some spelling variations:
professional perspectives » regional perspectives, professional practices, professional practice
professional experience » personal experience, professional competence
personal perspectives » personal perspective, regional perspectives, national perspectives

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: ((((professional expertise) OR (professional experience))) OR (((professional perspectives) OR (personal perspectives)))) distilled.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((professional expertise) or (professional experience))) or (((professional perspectives) OR (personal perspectives)))) distilled".
• Adding a wildcard symbol may retrieve word variants: ((((professional expertise) or (professional experience))) or (((professional perspectives) OR (personal perspectives)))) distilled*.