Perhaps you should try some spelling variations:
"national investment series series" » "international investment series series", "capital investment series series", "national treatment series series", "national investment services series", "national investment barriers series", "national investment treaties series", "national investment serie series", "national investment theories series"
"industrial development case series" » "industrial development china series", "industrial development care series", "industrial development cass series", "industrial development case stories"

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

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