Perhaps you should try some spelling variations:
"Industrial development research persona" » "Industrial development report persona", "Industrial development research personal", "Industrial development research personas", "Industrial development research purpose"
"industrial development results period" » "industrial development report period", "industrial development results per", "industrial development results operation"

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: (("Industrial development research persona") OR ("industrial development results period"))~.
• Removing quotes may allow a broader search: (( Industrial development research persona ) or ( industrial development results period ))~.
• Adding a wildcard symbol may retrieve word variants: (("Industrial development research persona") or ("industrial development results period"))*.