Perhaps you should try some spelling variations:
"industrial investment theory series" » "industrial investments theory series", "industry investment theory series", "initial investment theory series", "industrial investment treaty series", "industrial investment through series", "industrial investment entry series"
"industrial development cass series" » "industrial development cases series", "industrial development case series", "industrial development cash series", "industrial development class series", "industrial development laws series", "industrial development maps series"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("industrial investment theory series") or ("industrial development cass series"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("industrial investment theory series") OR ("industrial development cass series")).
• Removing quotes may allow a broader search: (( industrial investment theory series ) or ( industrial development cass series )).
• Adding a wildcard symbol may retrieve word variants: (("industrial investment theory series") or ("industrial development cass series"))*.