Perhaps you should try some spelling variations:
"industrial developing forest period" » "industries developing forest period", "industry developing forest period", "industrial developments forest period", "industrial developing forms period", "industrial development forest period", "industrial developing coherent period", "industrial developing first period", "industrial developing rest period", "industrial developing rest periods"
"industrial development efforts series" » "industrial development report series", "industrial development reports series", "industrial development efforts sometimes", "industrial development exporters series"

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 efforts series") OR ("industrial developing forest period"))~.
• Removing quotes may allow a broader search: (( industrial development efforts series ) or ( industrial developing forest period ))~.
• Adding a wildcard symbol may retrieve word variants: (("industrial development efforts series") or ("industrial developing forest period"))*.