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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"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"))*.